I changed my desktop environment to lightdm to check it out, but decided I like the default better and changed it back. However, after removing lightdm and reinstalling gdm3, I had two new problems. (1) I can no longer drag and drop "favorite" or pinned icons, and (2) it seems that most of the time when I click on icons, rather then open, they "stick" and get dragged off the dock, rather than opening.

  • Solved it myself. For anyone stumbling across this, I ran rm -rf ~/.compiz-1 ~/.config/compiz-1, then sudo apt-get install --reinstall ubuntu-desktop and restarted, and it was fixed. – Valence May 16 '19 at 21:14

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