[Bug 1874121] Re: 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.

[Brian Murray]

You do actually have packages left over installed from the ubuntu-
toolchain-r PPA or the jonathonf_ubuntu_gcc-7 PPA and those packages are
preventing your ability to upgrade to a new release of Ubuntu. You'll
need to resolve this issue, likely by installing the official Ubuntu
packages, yourself and try the upgrade again.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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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.

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  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:

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