[Bug 1897348] Re: Upgrade from ubuntu 18.04 to ubuntu 20.04 error

[Brian Murray]

*** This bug is a duplicate of bug 1898152 ***
    https://bugs.launchpad.net/bugs/1898152

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1898152, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** This bug has been marked a duplicate of bug 1898152
   upgrade fails to calculate if gnuradio-dev is installed

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https://bugs.launchpad.net/bugs/1897348

Title:
  Upgrade from ubuntu 18.04 to ubuntu 20.04 error

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

Bug description:
  I ran the terminal cmd sudo do-release-upgrade -d and errored out 
  An unresolvable problem occurred while calculating the upgrade. 

  This was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 
  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  
  from logs /var/log/dist-upgrade/main.log

  2020-09-25 17:14:27,701 DEBUG updateSourcesList()
  2020-09-25 17:14:27,710 DEBUG rewriteSourcesList() with mirror_check
  2020-09-25 17:14:27,711 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
  2020-09-25 17:14:27,711 DEBUG Checking pkg: ubuntu-minimal
  2020-09-25 17:14:27,712 DEBUG BaseMetaPkg 'ubuntu-minimal' has no candidate.origins
  2020-09-25 17:14:27,843 ERROR NoDistroTemplateException raised: Error: could not find a distribution template for Ubuntu/bionic
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-l840cs21/DistUpgrade/DistUpgradeController.py", line 538, in rewriteSourcesList
      distro.get_sources(self.sources)
    File "/tmp/ubuntu-release-upgrader-l840cs21/DistUpgrade/distro.py", line 93, in get_sources
      (self.id, self.codename))
  DistUpgrade.distro.NoDistroTemplateException: Error: could not find a distribution template for Ubuntu/bionic
  2020-09-25 17:14:27,844 DEBUG get_distro().enable_component("main") failed, overwriting sources.list instead as last resort
  2020-09-25 17:14:27,845 DEBUG examining: 'deb http://archive.canonical.com/ubuntu bionic partner'
  2020-09-25 17:14:27,845 DEBUG verifySourcesListEntry: deb http://archive.canonical.com/ubuntu focal partner
  2020-09-25 17:14:27,846 DEBUG url_downloadable: http://archive.canonical.com/ubuntu/dists/focal/Release
  2020-09-25 17:14:27,846 DEBUG s='http' n='archive.canonical.com' p='/ubuntu/dists/focal/Release' q='' f=''
  2020-09-25 17:14:27,924 DEBUG entry 'deb http://archive.canonical.com/ubuntu focal partner' updated to new dist
  2020-09-25 17:14:27,924 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu focal main restricted # auto generated by ubuntu-release-upgrader'
  2020-09-25 17:14:27,924 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu focal main restricted # auto generated by ubuntu-release-upgrader' is already set to new dist
  2020-09-25 17:14:27,925 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu focal-updates main restricted # auto generated by ubuntu-release-upgrader'
  2020-09-25 17:14:27,925 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu focal-updates main restricted # auto generated by ubuntu-release-upgrader' is already set to new dist
  2020-09-25 17:14:27,925 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu focal-security main restricted # auto generated by ubuntu-release-upgrader'
  2020-09-25 17:14:27,925 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security main restricted # auto generated by ubuntu-release-upgrader' is already set to new dist
  2020-09-25 17:14:27,927 DEBUG running doUpdate() (showErrors=True)
  2020-09-25 17:14:33,447 DEBUG openCache()
  2020-09-25 17:14:33,780 DEBUG Comparing 5.3.0-40 with 
  2020-09-25 17:14:33,781 DEBUG Comparing 5.4.0-42 with 5.3.0-40
  2020-09-25 17:14:33,782 DEBUG Comparing 5.4.0-47 with 5.4.0-42
  2020-09-25 17:14:33,782 DEBUG Comparing 5.4.0-48 with 5.4.0-47
  2020-09-25 17:14:33,830 DEBUG /openCache(), new cache size 10189
  2020-09-25 17:14:33,830 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
  2020-09-25 17:14:33,831 DEBUG quirks: running PreDistUpgradeCache
  2020-09-25 17:14:33,831 DEBUG running Quirks.PreDistUpgradeCache
  2020-09-25 17:14:33,831 INFO installing python-is-python2 because python-minimal was installed
  2020-09-25 17:14:33,831 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
  2020-09-25 17:14:33,831 INFO removing python-minimal because python-is-python2 is being installed
  2020-09-25 17:14:33,831 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
  2020-09-25 17:14:34,524 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
  2020-09-25 17:14:34,528 DEBUG abort called
  2020-09-25 17:14:34,529 DEBUG openCache()
  2020-09-25 17:14:34,730 DEBUG Comparing 5.3.0-40 with 
  2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-42 with 5.3.0-40
  2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-47 with 5.4.0-42
  2020-09-25 17:14:34,731 DEBUG Comparing 5.4.0-48 with 5.4.0-47
  2020-09-25 17:14:34,747 DEBUG /openCache(), new cache size 2695

  
  I ran all updates and upgrades to ubuntu 18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38 [origin: unknown]
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Fri Sep 25 17:23:36 2020
  InstallationDate: Installed on 2019-08-06 (416 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-25 (0 days ago)

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