[Bug 1807376] Re: can not upgrade to release 18.04 from 16.04

[Juhani Numminen]

Hi!

It seems like you've installed 3rd party drivers. Please remove them and
see if the upgrade succeeds then.

Quoting https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

=== Upgrading to a newer Ubuntu ===
It is *strongly* suggested to remove all packages from this PPA before updating to a newer Ubuntu release. See the section "Revert to original drivers" later on.
Then, after the upgrade, you can add again this PPA.

=== Revert to original drivers ===
To revert to standard Ubuntu drivers type the following in a prompt shell:
$ sudo apt-get install ppa-purge
$ sudo ppa-purge ppa:oibaf/graphics-drivers

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

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https://bugs.launchpad.net/bugs/1807376

Title:
  can not upgrade to release 18.04 from 16.04

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

Bug description:
  Upgrading to release 18.04 crashes without any meaningful error, only

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri Dec  7 13:28:02 2018
  InstallationDate: Installed on 2016-05-18 (932 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-12-07 (0 days ago)

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