[Bug 1901596] Re: Could not calculate the upgrade, no reason given

[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/1901596

Title:
  Could not calculate the upgrade, no reason given

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

Bug description:
  Updating from 18.04 LTS to 20.04 LTS, got an error message "could not
  calculate the upgrade ". Originally the error message claimed that I
  needed to purge PPA's from my system. I deleted all the "other
  software" PPA's in the software and updates program, then tried to run
  the system updater again.  This time it still failed to calculate the
  upgrade, but did not give any reason whatsoever.  Because there was no
  reason, and it said to file a bug report if "none of these reasons
  apply" I am filing a bug report.  I apologize if this is insufficient
  information but I am not a very experienced user.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.36
  ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 26 14:58:51 2020
  InstallationDate: Installed on 2018-05-16 (893 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-26 (0 days ago)
  VarLogDistupgradeTermlog:

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