I've also had the same problem. I tested it with a few extensions and the error happened with all of them, so it seems to be an issue with the start of a gnome session. It happens mostly with guest sessions, but I've also seen it happen in normal sessions occasionally.
I'm also using Ubuntu Gnome 16.04 and lightdm. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1713513 Title: notification for extensions keep reapearing Status in lightdm package in Ubuntu: New Bug description: after installing lightdm and login in the guest session, all extensions with notifications restart a few times (at least two, most I've seen is 6) this only started happening after logging off and on again in the guest session. I couldn't find a way to solve this other than turning off the notifications of those extensions, I tested and even the standard extensions that come with Ubuntu Gnome 16.04 show the same issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1713513/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp