There seems to be an issue with the mirror of the Ubuntu archive which you are using - the Release file is missing for at least Cosmic. http://mirrors.nayatel.com/ubuntu//dists/cosmic/ I'd suggest switching mirrors of the Ubuntu archive and trying the upgrade again.
>From VarLogDistupgradeMainlog.txt: 2019-05-08 15:06:45,740 DEBUG verifySourcesListEntry: deb http://mirrors.nayatel.com/ubuntu/ cosmic main restricted 2019-05-08 15:06:45,740 DEBUG url_downloadable: http://mirrors.nayatel.com/ubuntu//dists/cosmic/Release 2019-05-08 15:06:45,740 DEBUG s='http' n='mirrors.nayatel.com' p='/ubuntu//dists/cosmic/Release' q='' f='' 2019-05-08 15:06:45,808 DEBUG error from httplib: 'HTTP Error 404: Not Found' ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete ** Summary changed: - ubuntu is not upgrading + ubuntu is not upgrading because the mirror has no Release file -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1828206 Title: ubuntu is not upgrading because the mirror has no Release file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1828206/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
