I used Y-PPA-Manager to purge all the PPAs. This is a GUI tool. The Y-PPA-Manager tool can be easily installed using the “WebUpd8” team PPA as shown.
$ sudo add-apt-repository ppa:webupd8team/y-ppa-manager $ sudo apt update $ sudo apt install y-ppa-manager After successfully installing y-ppa-manager, i launch it from the terminal as follow. $ y-ppa-manager I also purged the PPA of the Y-PPA-Manager ofcourse. After doing this, the upgrade went smoothly. Maybe it is an idea to create an update for 16.04 where this is automatically done in the upgrade? (and with a notification) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1803318 Title: Upgrade to 18.04 fails from 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1803318/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
