Thank you for taking the time to report this bug and trying to help make Ubuntu better.
Your initial description provides the error message "was likely caused by Unofficial software packages.. Please use the tool 'ppa-purge' ..." which you then stated "I have done it but it appears again" Your system messages though still show many packages that are Unofficial 16.04 packages from non-Ubuntu sources, eg. Broken ros-kinetic-rqt-robot-steering:amd64 Depends on ros-kinetic- rostopic [ amd64 ] < 1.12.14-0xenial-20190608-041049-0800 You may have removed some of your sources that were creating problems, but as far as I can see the message still covers other sources & packages that were not yet removed. If you are interested in learning more about software repositories and Ubuntu, check https://help.ubuntu.com/community/Repositories. If you believe this is wrong, please respond with more detail and you can change the status back to 'New'. Thanks again for for taking the time to report this bug and helping to make Ubuntu better ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1837271 Title: trying to update ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1837271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
