OK, thanks.
Please run this command:
dpkg -l > allpackages.txt
and send us the resulting file 'allpackages.txt'.
** Package changed: ubuntu => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: Invalid => Incomplete
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** Attachment added: "allpackages.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1814125/+attachment/5241563/+files/allpackages.txt
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