Thank you, removing both "xserver-xorg-video-intel" package and /etc/X11/xorg.conf.d/20-intel.conf file solved all the issues I had
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1867668 Title: Visual artifacts in Gnome Shell after upgrading to 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1867668/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs