[Bug 1897960] Re: the update from 18.04 to 20.04 doesn't works properly

[Brian Murray]

*** This bug is a duplicate of bug 1813354 ***
    https://bugs.launchpad.net/bugs/1813354

** This bug has been marked a duplicate of bug 1813354
   release-upgrader unable to deal with sources.list entries of "deb mirror://"

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https://bugs.launchpad.net/bugs/1897960

Title:
  the update from 18.04 to 20.04 doesn't works properly

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

Bug description:
  
  sudo do-release-upgrade -d -f DistUpgradeViewGtk3 doesn't terminate the insstallation

  1st advise
  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can
  re-enable them after the upgrade with the 'software-properties' tool
  or your package manager.

  I chose Close

  Could not calculate the upgrade

  
  then appear 
  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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Sep 30 21:22:51 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-30 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-09-30 21:21:45.721706
   Log time: 2020-09-30 21:22:08.161679
   Log time: 2020-09-30 21:22:37.723017
   Log time: 2020-09-30 21:22:56.863454
  VarLogDistupgradeTermlog:

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