I've found remains of mate, removed it:
$ sudo apt remove -y ubuntu-mate-desktop mate-* ubuntu-mate-* \
plymouth-theme-ubuntu-mate-* lightdm
$ sudo apt autoremove -y
$ sudo apt install --reinstall -y gdm3
$ sudo reboot
Now everything works just fine. Please, close this bug.
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https://bugs.launchpad.net/bugs/1798957
Title:
Folders on Desktop are not openned
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