Same problem here with CALEXT2 and MM newsfeed module.

Welcome to the club!
I have the same error.
First I thought this is about the Lets Encrypt Certificate, but all of the newsfeeds I use doesn’t use Lets Encrypt.
The certificate is ok when you use curl…

Hi Sam!
Thank you for your support!

Unfortunately all my last tries were not successful.
Even your upgrade scripts with apply and force…

So I decided to start from scratch.
I removed/purged nodejs completly from the system and installed all new.

Now it is running as it should.

Don’t know what it was and I hope that this will not come back by the next upgrade…

Hi!
I’m very new to MM2 and had the MM2 running for 2-3 weeks without problems.
But after the update to 2.11.0 the MM2 starts sometimes with black screen.
Here ist the output of the logfiles:

/home/pi/.pm2/logs/mm-out.log

> magicmirror@2.11.0 start /home/pi/MagicMirror
> DISPLAY="${DISPLAY:=:0}" ./node_modules/.bin/electron js/electron.js

[2020-04-10 07:06:04.275] [LOG]    Starting MagicMirror: v2.11.0
[2020-04-10 07:06:04.322] [LOG]    Loading config ...
[2020-04-10 07:06:04.336] [LOG]    Loading module helpers ...
[2020-04-10 07:06:04.340] [LOG]    No helper found for module: alert.
[2020-04-10 07:06:04.460] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:04.461] [LOG]    Module helper loaded: updatenotification
[2020-04-10 07:06:04.464] [LOG]    No helper found for module: clock.
[2020-04-10 07:06:05.408] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:05.409] [LOG]    Module helper loaded: MMM-MyCalendar
[2020-04-10 07:06:06.272] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:06.273] [LOG]    Module helper loaded: MMM-DWD-WarnWeather
[2020-04-10 07:06:07.295] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:07.300] [LOG]    Module helper loaded: MMM-DarkSkyForecast
[2020-04-10 07:06:07.717] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:07.718] [LOG]    Module helper loaded: MMM-CalendarExt2
[2020-04-10 07:06:07.859] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:07.860] [LOG]    Module helper loaded: MMM-Bring
[2020-04-10 07:06:07.942] [LOG]    Initializing new module helper ...
[2020-04-10 07:06:07.943] [LOG]    Module helper loaded: newsfeed
[2020-04-10 07:06:07.943] [LOG]    All module helpers loaded.
[2020-04-10 07:06:08.257] [LOG]    Starting server on port 8080 ... 
[2020-04-10 07:06:08.286] [LOG]    Server started ...
[2020-04-10 07:06:08.287] [LOG]    Connecting socket for: updatenotification
[2020-04-10 07:06:08.289] [LOG]    Connecting socket for: MMM-MyCalendar
[2020-04-10 07:06:08.290] [LOG]    Starting node helper for: MMM-MyCalendar
[2020-04-10 07:06:08.291] [LOG]    Connecting socket for: MMM-DWD-WarnWeather
[2020-04-10 07:06:08.292] [LOG]    MMM-DWD-WarnWeather helper started...
[2020-04-10 07:06:08.293] [LOG]    Connecting socket for: MMM-DarkSkyForecast
[2020-04-10 07:06:08.294] [LOG]    ====================== Starting node_helper for module [MMM-DarkSkyForecast]
[2020-04-10 07:06:08.295] [LOG]    Connecting socket for: MMM-CalendarExt2
[2020-04-10 07:06:08.297] [LOG]    Connecting socket for: MMM-Bring
[2020-04-10 07:06:08.298] [LOG]    Connecting socket for: newsfeed
[2020-04-10 07:06:08.299] [LOG]    Starting module: newsfeed
[2020-04-10 07:06:08.300] [LOG]    Sockets connected & modules started ...
[2020-04-10 07:06:08.833] [LOG]    Launching application.

/home/pi/.npm/_logs/2020-04-09T06_07_27_758Z-debug.log

0 info it worked if it ends with ok
1 verbose cli [ '/usr/bin/node', '/usr/bin/npm', 'start' ]
2 info using npm@6.13.4
3 info using node@v10.19.0
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle magicmirror@2.11.0~prestart: magicmirror@2.11.0
6 info lifecycle magicmirror@2.11.0~start: magicmirror@2.11.0
7 verbose lifecycle magicmirror@2.11.0~start: unsafe-perm in lifecycle true
8 verbose lifecycle magicmirror@2.11.0~start: PATH: /usr/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/home/pi/MagicMirror/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games
9 verbose lifecycle magicmirror@2.11.0~start: CWD: /home/pi/MagicMirror
10 silly lifecycle magicmirror@2.11.0~start: Args: [ '-c',
10 silly lifecycle   'DISPLAY="${DISPLAY:=:0}" ./node_modules/.bin/electron js/electron.js' ]
11 silly lifecycle magicmirror@2.11.0~start: Returned: code: 1  signal: null
12 info lifecycle magicmirror@2.11.0~start: Failed to exec start script
13 verbose stack Error: magicmirror@2.11.0 start: `DISPLAY="${DISPLAY:=:0}" ./node_modules/.bin/electron js/electron.js`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (/usr/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
13 verbose stack     at EventEmitter.emit (events.js:198:13)
13 verbose stack     at ChildProcess.<anonymous> (/usr/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:198:13)
13 verbose stack     at maybeClose (internal/child_process.js:982:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:259:5)
14 verbose pkgid magicmirror@2.11.0
15 verbose cwd /home/pi/MagicMirror
16 verbose Linux 4.19.97-v7+
17 verbose argv "/usr/bin/node" "/usr/bin/npm" "start"
18 verbose node v10.19.0
19 verbose npm  v6.13.4
20 error code ELIFECYCLE
21 error errno 1
22 error magicmirror@2.11.0 start: `DISPLAY="${DISPLAY:=:0}" ./node_modules/.bin/electron js/electron.js`
22 error Exit status 1
23 error Failed at the magicmirror@2.11.0 start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

When I try to start the MM2 2-3 times the black screen goes away and the MM2 is running normal.

I don’t know much about npm so I’m totally lost.
Maybe someone have an idea what I can try to solve this problem.