thank you for your bug but downgrades from ppa are not handled in an official way, you should be able to try a second time to downgrade it to work around the issue though
** Changed in: gnome-session (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-session (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/785593 Title: package gnome-session 2.32.1-0ubuntu19 failed to install/upgrade: Versuch, »/usr/share/gnome-session/sessions/ubuntu.session« zu überschreiben, welches auch in Paket gnome-session-common 2.32.1-0ubuntu20 ist -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs