Following up with my error message when attempting the upgrade.sh
pi@Jon-MM:~/MagicMirror $ bash -c "$(curl -sL https://raw.githubusercontent.com/MichMich/MagicMirror/master/installers/upgrade-script.sh)"
the log will be /home/pi/MagicMirror/installers/upgrade.log
No LSB modules are available.
doing test run = true
update log will be in /home/pi/MagicMirror/installers/upgrade.log
saving custom.css
cp: cannot stat 'custom.css': No such file or directory
upgrading from version 2.10.0 to 2.10.0
fetching latest revisions
there are 1 local files that are different than the master repo
package-lock.json
any *-lock.json files do not need to be saved
do you want to save these files for later (Y/n)?n
skipping restore for package-lock.json, doing test run
no modules found needing npm refresh
restoring custom.css
cp: cannot stat 'save_custom.css': No such file or directory
rm: cannot remove 'save_custom.css': No such file or directory