[Bug 1959485] Re: reproducible crash in jammy: Uncaught exception: ../../src/ui.cc:1549: void auto_fix_broken(): Assertion "resman->resolver_exists()" failed.

[Rolf Leggewie]

Thank you Axel, for having a look.

I am in the process of creating the requested information and will make
it available to you privately.  Not sure if that's necessary, though as
it should be fairly easy to reproduce this problem.

1) create jammy chroot/VM
2) add focal to sources.list
3) install autoradio, python-is-python2 and python3-six from focal
4) sudo aptitude and try to update autoradio (I assume this will trigger the resolver, let it choose to upgrade autoradio to jammy and keep the other focal packages around)
5) I was surprised to find that despite choosing a resolution from aptitude resolver, aptitude shows broken packages at this point
6) hit g and witness the crash

** Changed in: aptitude (Ubuntu)
       Status: Incomplete => New

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Title:
  reproducible crash in jammy: Uncaught exception: ../../src/ui.cc:1549:
  void auto_fix_broken(): Assertion "resman->resolver_exists()" failed.

Status in aptitude package in Ubuntu:
  New

Bug description:
  When updating from focal to jammy I found the following reproducible
  way to crash aptitude.

  $ apt policy python3-chardet
  python3-chardet:
    Installed: 3.0.4-4build1
    Candidate: 4.0.0-1
    Version table:
       4.0.0-1 500
          500 http://de.archive.ubuntu.com/ubuntu jammy/main amd64 Packages
          500 http://de.archive.ubuntu.com/ubuntu jammy/main i386 Packages
   *** 3.0.4-4build1 500
          500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          500 http://de.archive.ubuntu.com/ubuntu focal/main i386 Packages
          100 /var/lib/dpkg/status

  python3-chardet and python3-six cannot currently upgrade on my machine
  due to bug 1958720.  Updated packages come in all the time for jammy
  at the moment.  When I hit + on the section of "Upgradable Packages"
  in aptitude I am thus currently always breaking packages.  Aptitude
  calculates a way for me to resolve the problem, usually holding a
  couple of packages at their current version.  I accept and then
  aptitude still shows 2 broken packages (this is a bug in itself, I
  guess).  I can verify with b that the broken packages are
  python3-chardet and python3-six.  I can hold both packages with : and
  move on and nothing bad happens.  But if I don't do that and instead
  rely on aptitude resolving conflicts before installing by hitting g,
  then aptitude will reliably crash.

  $ sudo aptitude
  Uncaught exception: ../../src/ui.cc:1549: void auto_fix_broken(): Assertion "resman->resolver_exists()" failed.

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