Comment 20 for bug 1359199

I also have mono and keepass2 installed. After uninstalling keepass2 (sudo apt remove keepass2 -- mono was still installed), mouse focus started working immediately. I've reinstalled keepass2 and mouse focus still works. Doesn't make any sense.

Does it have to do with the post-installation triggers (i.e. what happens below)? I have no idea.

Removing keepass2 (2.32+dfsg-1) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for hicolor-icon-theme (0.15-0ubuntu1) ...
Processing triggers for shared-mime-info (1.5-2ubuntu0.1) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu3.1) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu5) ...
Processing triggers for mime-support (3.59ubuntu1) ...
Processing triggers for bamfdaemon (0.5.3~bzr0+16.04.20160824-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...