[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Incomplete => Expired
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Thank you for taking the time to report this issue and helping to make
Ubuntu better.
The error message you obtained says
"* Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade
You can 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
(I intended adding this