[Bug 1897990] Re: update-manager failed to update: apt has no solutions

[bsy]

After removing python dbg packages, the upgrade succeeded.

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https://bugs.launchpad.net/bugs/1897990

Title:
  update-manager failed to update: apt has no solutions

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

Bug description:
  apt.log appears to be full of complaints about python2 packages.  in
  any case, the update manager seems to have restored my system to a
  sane state.  i haven't tried removing infrequently used python2
  packages yet to see if that would help.

  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  update-manager:
    Installed: 1:18.04.11.13
    Candidate: 1:18.04.11.13
    Version table:
   *** 1:18.04.11.13 500
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:18.04.11 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages
  update-manager-core:
    Installed: 1:18.04.11.13
    Candidate: 1:18.04.11.13
    Version table:
   *** 1:18.04.11.13 500
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:18.04.11 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages

  i expected a seamless upgrade to 20.04.

  update-manager failed, but seems to have restored the system to a sane
  state.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 30 18:04:23 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 2017-02-19 (1319 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=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-01 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2020-09-30T17:59:57.212485

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