I edited a file in /usr/gnome-shell/share/theme/ubuntu.css. I did the editing in the block #lockDialogGroup I used the wrong syntax and my computer will not boot. What commands would I use safe mode root@Douce (my computer name) to re-edit the file so my computer will boot. I don't want to do a fresh install.
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N0rbert
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The most straightforward solution will be to reinstall its gnome-shell-common package from simple terminal session (Ctrl+Alt+F3):
sudo apt-get install --reinstall gnome-shell-common
to revert file to the default contents.
N0rbert
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/and then edit the file. Another way is to boot from LiveUSB and edit from there. – Pilot6 Jan 07 '20 at 23:24