Thank you for taking the time to report this issue and helping to make Ubuntu better.
I see numerous 'ros-melodic*' packages which are 3rd party (from PPA or other 3rd party source) as not found on https://packages.ubuntu.com/search?suite=all&arch=any&searchon=names&keywords=ros-melodic or Ubuntu repositories for any release. https://help.ubuntu.com/community/Repositories/Ubuntu If you need support on the use of ppa-purge, this bug report can be converted to a question, or you can ask a question at https://answers.launchpad.net/ubuntu. You can also find help with your problem in the support forum of your local Ubuntu community http://loco.ubuntu.com/ or asking at https://askubuntu.com or https://ubuntuforums.org, or for more support options please look at https://discourse.ubuntu.com/t/community-support/709 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890989 Title: can't upgrade to ubuntu 20.04.1 LTS , says caused by unofficial software packages not provided by ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1890989/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
