Since people might get hit by this problem, I'm including a possible
solution to it.

WARNING, it will remove most of your packages (and install some) and
their configuration.

How to somewhat refresh Ubuntu by removing almost all packages and
reinstalling ubuntu-desktop:

1. Download the attached file: leftpackages.list

2. Run the following lines in the folder where the leftpackagest.list
file is located:

rm minimum.list
# make list of packages to remove which are not in leftpackages.list
dpkg --get-selections | while read line; do if ! cat leftpackages.list | grep 
"$line" > /dev/null; then echo "$line" | sed -e 
's/\([^e]\)install/\1deinstall/' >> minimum.list; else echo "$line" >> 
minimum.list; fi; done
# mark those packages that should be removed
sudo dpkg --set-selections < minimum.list
# remove them
sudo apt-get dselect-upgrade
# remove their config
sudo aptitude purge '~c'

3. Install ubuntu desktop:

sudo apt install ubuntu-desktop --install-recommends


** Attachment added: "leftpackages.list"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1893168/+attachment/5405337/+files/leftpackages.list

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https://bugs.launchpad.net/bugs/1893168

Title:
  groovy gnome-shell crash

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