Same issue on Ubuntu MATE as well (as tested on hirsute daily build). On
Xubuntu, when I ran `gnome-software` from terminal, I see following
error (last line is when I clicked on 'Restart & Update' button).
sai@sai-Standard-PC-Q35-ICH9-2009:~$ gnome-software
13:50:47:0180 Gs enabled plugins: des
FYI - works as expected under UB
ok - under UB - I saw the restart button after installing. Clicking on
it restarted UB - then I saw updates installing via plymouth on a reboot
... it rebooted again and there are no more updates.
Note - for UB our default is not to have updates via gnome-softwar