Looking at that machine with htop, and no one logged in on its own console as its waiting for a login because a power bump rebooted it in the night last night and I haven't been up to the shop building to login since.
I see no wayland and 3 instances of xorg running. So its the GTK stuff thats actually missing and the error message I paste quoted is miss-leading. Since the default gui is xfce4, what do I "apt install" to restore gksudo and synaptic to normal function? Thanks Tomas Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>