Just finished a large update including kernel. But, as usual, I had to select the update icon from the plank panel to activate the update process.
In standard (Gnome or Unity), if an update is available, I get an icon popup in the launcher/panel. Not so for UbuBudgie.
Further, after a longish period of time (3 weeks or so), I get an applet in the top dock warning update process fail?? (my phrasing, but that’s the gist).