lets do this to get a new copy and use your config/modules…
copy paste this section to a terminal window

cd ~
# save MM folder
mv MagicMirror MagicMirror.org
# install new MM (reply N to screen saver/pm2
bash -c  "$(curl -sL https://raw.githubusercontent.com/sdetweil/MagicMirror_scripts/master/raspberry.sh)"

once MM is installed again lets make THIS new version look like the old
copy/paste this

# copy files
cd ~
cp MagicMirror.org/config/config.js MagicMirror/config
cp MagicMirror.org/css/custom.css MagicMirror/css
cd MagicMirror/modules
# save the new default module folder
mv default ..
cd ..
# copy all the org modules 
cp -r -p ~/MagicMirror.org/modules .
cd modules
# remove the old default  modules folder
rm -rf default
# move back the new default 
mv ../default .
cd ~/MagicMirror

now
npm start should work

git status

junior@MAGIC-MIRROR:~ $ cd ~/MagicMirror/modules/MMM-Config
junior@MAGIC-MIRROR:~/MagicMirror/modules/MMM-Config $ git status
On branch main
Your branch is up to date with ‘origin/main’.

nothing to commit, working tree clean
junior@MAGIC-MIRROR:~/MagicMirror/modules/MMM-Config $

junior@MAGIC-MIRROR:~/MagicMirror/modules/MMM-Config $ cd ~/MagicMirror
junior@MAGIC-MIRROR:~/MagicMirror $ git status
fatal: not a git repository (or any of the parent directories): .git
junior@MAGIC-MIRROR:~/MagicMirror $

the git checkout command should have worked,
but failed.

now i am trying to figure out why. and what to do about it

the command prompt looks different after

cd ~/MagicMirror 

then the last time you did a command

so try this way

go to your MagicMirror folder
and do git status

show the results

how did you install MagicMirror
manual, scripted or zip file download ?

cd ~/MagicMirror
git checkout modules/default/updatenotification/updatenotification.js

it checkout modules/default/updatenotification/updatenotification.js
fatal: not a git repository (or any of the parent directories): .git
junior@MAGIC-MIRROR:~/MagicMirror $

lets restore the updatenotification module file

cd ~/MagicMirror
git checkout modules/default/updatenotification/updatenotification.js

then lets edit config.js to disable the module

 {
      module:"updatenotification",
      position:"top_bar",
      disabled:true
  },

My bad,iI was trying to dissable the “Update available” banner at the top of mirror

/* MagicMirror²

• Module: UpdateNotification

• By Michael Teeuw https://michaelteeuw.nl

• MIT Licensed.
  */
  Module.register(“updatenotification”, {
  defaults: {
  updateInterval: 10 * 60 * 1000, // every 10 minutes
  refreshInterval: 24 * 60 * 60 * 1000, // one day
  ignoreModules: [],
  sendUpdatesNotifications: false,
  updates: [],
  updateTimeout: 2 * 60 * 1000, // max update duration
  updateAutorestart: false // autoRestart MM when update done ?
  disabled: true;
  },

  suspended: false,
  moduleList: {},
  needRestart: false,
  updates: {},

  start () {
  Log.info(Starting module: ${this.name});
  this.addFilters();
  setInterval(() => {
  this.moduleList = {};
  this.updateDom(2);
  }, this.config.refreshInterval);
  },

  suspend () {
  this.suspended = true;
  },

  resume () {
  this.suspended = false;
  this.updateDom(2);
  },

  notificationReceived (notification) {
  switch (notification) {
  case “DOM_OBJECTS_CREATED”:
  this.sendSocketNotification(“CONFIG”, this.config);
  this.sendSocketNotification(“MODULES”, Object.keys(Module.definitions));
  break;
  case “SCAN_UPDATES”:
  this.sendSocketNotification(“SCAN_UPDATES”);
  break;
  }
  },

  socketNotificationReceived (notification, payload) {
  switch (notification) {
  case “REPO_STATUS”:
  this.updateUI(payload);
  break;
  case “UPDATES”:
  this.sendNotification(“UPDATES”, payload);
  break;
  case “UPDATE_STATUS”:
  this.updatesNotifier(payload);
  break;
  }
  },

  getStyles () {
  return [${this.name}.css];
  },

  getTemplate () {
  return ${this.name}.njk;
  },

  getTemplateData () {
  return { moduleList: this.moduleList, updatesList: this.updates, suspended: this.suspended, needRestart: this.needRestart };
  },

  updateUI (payload) {
  if (payload && payload.behind > 0) {
  // if we haven’t seen info for this module
  if (this.moduleList[payload.module] === undefined) {
  // save it
  this.moduleList[payload.module] = payload;
  this.updateDom(2);
  }
  } else if (payload && payload.behind === 0) {
  // if the module WAS in the list, but shouldn’t be
  if (this.moduleList[payload.module] !== undefined) {
  // remove it
  delete this.moduleList[payload.module];
  this.updateDom(2);
  }
  }
  },

  addFilters () {
  this.nunjucksEnvironment().addFilter(“diffLink”, (text, status) => {
  if (status.module !== “MagicMirror”) {
  return text;
  }

   	const localRef = status.hash;
   	const remoteRef = status.tracking.replace(/.*\//, "");
   	return `<a href="https://github.com/MichMich/MagicMirror/compare/${localRef}...${remoteRef}" class="xsmall dimmed difflink" target="_blank">${text}</a>`;
   });
  

  },

  updatesNotifier (payload, done = true) {
  if (this.updates[payload.name] === undefined) {
  this.updates[payload.name] = {
  name: payload.name,

you know you never edit any of the MagicMirror source or module source

all config goes in config/config.js and all css goes in css/custom.css

./test_convert.sh override

junior@MAGIC-MIRROR:~/MagicMirror/modules/MMM-Config $ ./test_convert.sh overri de
--------------------MMM-Config
module updatenotification-defaults has an error in the construction of its defau lts section
the error line is disabled: true;
please change it to the literal value of the referenced variable
and restart MagicMirror
--------------------MMM-Config
junior@MAGIC-MIRROR:~/MagicMirror/modules/MMM-Config $

cd ~/MagicMirror/modules/MMM-Config
./test_convert.sh  override

I used a fresh SD card for the reinstallation, but some of her modules are incompatible with the new setup. Consequently, my wife has firmly decided to stick with the current version until her modules stop functioning. Unfortunately, since one of the modules doesn’t work with the old MagicMirror version, I’m at an impasse. It is a pity, I wanted this as due to dyslexia, this would have been perfect for my situation

cd ~/MagicMirror/MMM-Config
./test-convert.sh override

you should get one message

completed

npm run config:check

[04.04.2025 16:09.03.683] [INFO] Checking file… /home/junior/MagicMirror/config/config.js
[04.04.2025 16:09.03.781] [INFO] Your configuration file doesn’t contain syntax errors :)
junior@MAGIC-MIRROR:~/MagicMirror $

so i cannot run it thru the

cd ~/MagicMirror 
npm run config:check

command

/*
* MagicMirror² Config Sample
 *
 * By Michael Teeuw https://michaelteeuw.nl
 * MIT Licensed.
 *
 * For more information on how you can configure this file
 * see https://docs.magicmirror.builders/configuration/introduction.html
 * and https://docs.magicmirror.builders/modules/configuration.html
 */
let config = {
	address: "localhost", 	// Address to listen on, can be:
							// - "localhost", "127.0.0.1", "::1" to listen on loopback interface
							// - another specific IPv4/6 to listen on a specific interface
							// - "0.0.0.0", "::" to listen on any interface
							// Default, when address config is left out or empty, is "localhost"
	port: 8080,
	basePath: "/", 	// The URL path where MagicMirror² is hosted. If you are using a Reverse proxy
					// you must set the sub path here. basePath must end with a /
	ipWhitelist: [], 	// Set [] to allow all IP addresses
															// or add a specific IPv4 of 192.168.2.49 :
															// ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.1.5"],
															// or IPv4 range of 192.168.3.0 --> 192.168.3.15 use CIDR format :
															// ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.3.0/28"],

	useHttps: false, 		// Support HTTPS or not, default "false" will use HTTP
	httpsPrivateKey: "", 	// HTTPS private key path, only require when useHttps is true
	httpsCertificate: "", 	// HTTPS Certificate path, only require when useHttps is true

	language: "en",
	locale: "en-US",
	logLevel: ["INFO", "LOG", "WARN", "ERROR"], // Add "DEBUG" for even more logging
	timeFormat: 24,
	units: "metric",
	// serverOnly:  true/false/"local" ,
	// local for armv6l processors, default
	//   starts serveronly and then starts chrome browser
	// false, default for all NON-armv6l devices
	// true, force serveronly mode, because you want to.. no UI on this device

	modules: [
	{
	module: 'MMM-MovieListings',
                                position: 'bottom_center',   // This can be any of the regions. Best results in left or$
                                config: {
					apiKey: '',
					region: 'GB',
					language: 'en-UK',
					interface: 'poster', //'list', 'poster', 'detailed'
					includeMoviePlot: false,
					maxPlotLength: 198,
					header: 'Kinofilme',
					moviesPerPage: 0,
					refreshInterval: 1000 * 60 * 60 * 24, //Once a day
					baseUrl: 'https://api.themoviedb.org/3/movie/now_playing',
					animationSpeed: 2.5 * 1000,
					pageChangeInterval: 35 * 1000
	}
},
	
{
        module: 'MMM-Globe',
	position: 'bottom_left',
	config: {
		style: 'geoColor',
		imageSize: 300,
		ownImagePath:'',
		updateInterval: 10*60*1000
        }
    },

{
  module: 'MMM-Tools',
  position: 'bottom_right',
  config: {
    refresh: 1000 * 5,
    containerSize: null,
    itemSize: null
  }
},


         {
    module: "MMM-EyeCandy",
    position: "top_center",
    config: {
        maxWidth: "75%",       // Sizes the images. Retains aspect ratio.
        style: '1',            // Style number or use ownImagePath to override style
        ownImagePath: '',      // 'modules/MMM-EyeCandy/pix/name-graphics-lisa-596441.jpg'
        }
        },




		{
			module: "alert",
		},
		{
			module: "updatenotification",
			position: "top_bar"
		},
		{
			module: "clock",
			position: "top_right"
		},
		{
			module: "calendar",
			header: "UK Holidays",
			position: "top_right",
			config: {
				calendars: [
					{
						symbol: "calendar-check-o ",
                        url: "https://www.calendarlabs.com/ical-calendar/ics/75/UK_Holidays.ics"
					}
				]
			}
		},
		{
			module: "compliments",
			position: "top_bar"
		},
		{
			module: "MMM-OpenmapWeather",
		position: "top_left",	// This can be any of the regions. Best results in left or right regions.
		header: "Current Weather", //Location is the default value if header is empty or not defined.
		config: {
			// See 'Configuration options' for more information.
			location: "CROYDON,LONDON",
			locationID: "2651817", //Location ID from http://openweathermap.org/help/city_list.txt
			appid: "",  //openweathermap.org API key
      			colorIcon: true
			}
		},

                {
		module:"MMM-Config",
		position:"top_left", 
			// the QR code (if requested) will appear here
		config:{
                        showQR: true
		}
	        },


		{
			module: "weather",
			position: "top_left",
			header: "Weather Forecast",
			config: {
				weatherProvider: "openweathermap",
				type: "forecast",
				location: "London",
				locationID: "2651817", //ID from http://bulk.openweathermap.org/sample/city.list.json.gz; unzip the gz file and find your city
				apiKey: ""
			}
		},
		{
			module: "newsfeed",
			position: "bottom_bar",
			config: {
				feeds: [
					{
						title: "BBC UK News",
						url: "http://feeds.bbci.co.uk/news/uk/rss.xml"
					}
				],
				showSourceTitle: true,
				showPublishDate: true,
				broadcastNewsFeeds: true,
				broadcastNewsUpdates: true
			}
		},
	]
};

/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== "undefined") {module.exports = config;}

also, you have some syntax error around line 122 in config.js

pm2 flush to empty the logs

and see what hsppens after you fix that config.js error

[27.03.2025 09:46.55.825] [ERROR] [31mWARNING! Could not validate config file. Starting with default configuration. Please correct syntax errors at or above this line: /home/junior/MagicMirror/config/config.js:122[39m
[31m config: {[39m
[31m ^^^^^^[39m

[31mSyntaxError: Unexpected identifier 'config’[39m
[31m at internalCompileFunction (node:internal/vm:73:18)[39m
[31m at wrapSafe (node:internal/modules/cjs/loader:1185:20)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1227:27)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
[31m at Function._load (node:electron/js2c/node_init:2:13357)[39m
[31m at Module.require (node:internal/modules/cjs/loader:1150:19)[39m
[31m at require (node:internal/modules/cjs/helpers:121:18)[39m
[31m at loadConfig (/home/junior/MagicMirror/js/app.js:118:14)[39m
[31m at App.start (/home/junior/MagicMirror/js/app.js:248:18)[39m
[31m at Object. (/home/junior/MagicMirror/js/electron.js:192:7)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1271:14)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 09:47.26.134] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 09:53.43.417] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 09:59.04.576] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 10:02.53.766] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 10:15.08.770] [ERROR] [31mWARNING! Could not validate config file. Starting with default configuration. Please correct syntax errors at or above this line: /home/junior/MagicMirror/config/config.js:130[39m
[31m {[39m
[31m ^[39m

[31mSyntaxError: Unexpected token '{'[39m
[31m at internalCompileFunction (node:internal/vm:73:18)[39m
[31m at wrapSafe (node:internal/modules/cjs/loader:1185:20)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1227:27)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
[31m at Function._load (node:electron/js2c/node_init:2:13357)[39m
[31m at Module.require (node:internal/modules/cjs/loader:1150:19)[39m
[31m at require (node:internal/modules/cjs/helpers:121:18)[39m
[31m at loadConfig (/home/junior/MagicMirror/js/app.js:118:14)[39m
[31m at App.start (/home/junior/MagicMirror/js/app.js:248:18)[39m
[31m at Object. (/home/junior/MagicMirror/js/electron.js:192:7)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1271:14)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 10:15.58.981] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGSEGV
[27.03.2025 10:22.57.762] [WARN] Version is incorrect. Skip module: ‘MMM-Config’
Warning: vkCreateInstance: Found no drivers!
Warning: vkCreateInstance failed with VK_ERROR_INCOMPATIBLE_DRIVER
at CheckVkSuccessImpl (…/…/third_party/dawn/src/dawn/native/vulkan/VulkanError.cpp:88)
at CreateVkInstance (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:458)
at Initialize (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:344)
at Create (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:266)
at operator() (…/…/third_party/dawn/src/dawn/native/vulkan/BackendVk.cpp:521)

/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 10:29.29.494] [ERROR] [31mWARNING! Could not validate config file. Starting with default configuration. Please correct syntax errors at or above this line: /home/junior/MagicMirror/config/config.js:130[39m
[31m {[39m
[31m ^[39m

[31mSyntaxError: Unexpected token '{'[39m
[31m at internalCompileFunction (node:internal/vm:73:18)[39m
[31m at wrapSafe (node:internal/modules/cjs/loader:1185:20)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1227:27)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
[31m at Function._load (node:electron/js2c/node_init:2:13357)[39m
[31m at Module.require (node:internal/modules/cjs/loader:1150:19)[39m
[31m at require (node:internal/modules/cjs/helpers:121:18)[39m
[31m at loadConfig (/home/junior/MagicMirror/js/app.js:118:14)[39m
[31m at App.start (/home/junior/MagicMirror/js/app.js:248:18)[39m
[31m at Object. (/home/junior/MagicMirror/js/electron.js:192:7)[39m
[31m at Module._compile (node:internal/modules/cjs/loader:1271:14)[39m
[31m at Object…js (node:internal/modules/cjs/loader:1326:10)[39m
[31m at Module.load (node:internal/modules/cjs/loader:1126:32)[39m
[31m at node:internal/modules/cjs/loader:967:12[39m
/home/junior/MagicMirror/node_modules/electron/dist/electron exited with signal SIGINT
[27.03.2025 10:30.26.627] [ERROR] [31mWARNING! Could not validate config file. Starting with default configuration. Please correct syntax errors at or above this line: /home/junior/MagicMirror/config/config.js:130[39m
[31m {[39m
[31m ^[39m

as using pm2 the good and error lines are separated into two lists

none of the bugsounet repos are online any more
so if you dont want to see those errors, you can exclude them from the updatenotification module scans