Public bug reported: I have no any ppa installed, then I don't what is the issue.
ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:16.04.29 ProcVersionSignature: Ubuntu 4.15.0-96.97~16.04.1-generic 4.15.18 Uname: Linux 4.15.0-96-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.23 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: GNOME-Flashback:Unity Date: Tue Apr 21 12:47:05 2020 EcryptfsInUse: Yes InstallationDate: Installed on 2017-10-12 (922 days ago) InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to xenial on 2020-04-21 (0 days ago) VarLogDistupgradeTermlog: ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874121 Title: I've tried to upgrade Ubuntu 16.04 to 18.04 from terminal but I couldn't do it. I have no problems with ppa, that doesn't apply in this case. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1874121/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs