[Bug 1892028] Re: Impossible to upgrade to 20.04 lts from 18.04

[Brian Murray]

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg and python packages. This will prevent the
upgrade as that PPA contains packages which generate failures when
trying to calculate the upgrade. You can revert the PPA by installing
the ppa-purge package from the official Ubuntu archive and then running
'sudo ppa-purge ppa:oibaf/graphics-drivers'.  After that you can try
upgrading again and if it still fails open a new bug report. Thanks and
good luck!

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

** Tags added: ppa xorg-oibaf-ppa

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https://bugs.launchpad.net/bugs/1892028

Title:
  Impossible to upgrade to 20.04 lts from 18.04

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

Bug description:
  Probably error in cache:
  2020-08-18 13:59:05,049 DEBUG running doUpdate() (showErrors=False)
  2020-08-18 13:59:15,107 ERROR IOError/SystemError in cache.update(): ''. Retrying (currentRetry: 0)
  2020-08-18 13:59:15,108 ERROR doUpdate() failed completely
  2020-08-18 13:59:15,108 DEBUG openCache()

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Tue Aug 18 14:15:46 2020
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-11-27 (629 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-18 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-18T09:56:03.859601

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