Comment 3 for bug 1751546

There is no vanilla-gnome-desktop task in the archives.

 sudo apt-get install vanilla-gnome-desktop^
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package vanilla-gnome-desktop^
E: Couldn't find task 'vanilla-gnome-desktop'
E: Couldn't find any package by regex 'vanilla-gnome-desktop^'

bionic: the seed is not running
artful: seed seems to be running, but its in the archive as ubuntu-gnome-desktop not vanilla-gnome-desktop

so apparently there is something wrong with the artful seed
and we need to get the bionic seed running again (since I am pretty sure that is what is required to get the Task into the archives)