This sounds like bug 1824874. To help us check that please:
1. Provide a screenshot or photo of the problem; and
2. After the dialog has appeared run:
journalctl -b0 > journal.txt
or if you had to reboot then run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1882481
Title:
A dialog box stays on desktop and does not go away
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