[Bug 1923681] Re: upgrader aborts with "could not calculate the upgrade"

[Brian Murray]

Thanks for taking the time to report this upgrade failure. There is
currently a new version of the release upgrader available in -proposed
which may resolve the error you've encountered. Please run the following
command to test the new version of the upgrader:

  do-release-upgrade -p

Please lets us know the results in this bug report. Thanks again and
good luck!

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

** Tags added: lp-1928397

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https://bugs.launchpad.net/bugs/1923681

Title:
  upgrader aborts with "could not calculate the upgrade"

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

Bug description:
  In /var/log/upgrade/apt.log i see this

  Investigating (9) python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib >
  Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
    Considering python2:amd64 5 as a solution to python-is-python2:amd64 5
    Ignore MarkKeep of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected
    Removing python-is-python2:amd64 rather than change python2:amd64
    Ignore MarkDelete of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected

  But no python-is-python2 package is installed, and i dont seem to be
  able to install it either.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
  Uname: Linux 4.15.0-141-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Apr 14 02:17:17 2021
  Ec2AMI: ami-00000143
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: 4C-10GB-500GB
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-14 (0 days ago)

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