[Bug 1892915] Re: gnome-shell crashing (libffi8ubuntu1 upgrade issue)

[satmandu]

@vorlon it is in the graphic which shows up in the GUI surrounding the checkbox to enable -proposed
here: https://wiki.ubuntu.com/Testing/EnableProposed?action=AttachFile&do=get&target=devoptions_1604.png


Thank you @knox for the clarification. This was largely my fault for doing a 's/focal/groovy/g' in my sources.list.

I can't speak to whether the GUI source selection interface allows one
to add -proposed to the primary sources.list when the devel series is
running though.

Is there a way to tell apt that packages which have a dependency upon
libffi7 should absolutely not be mixed with packages which depend upon
libffi8 because there is a breaking change? (I imagine there is no
automated way to notice that hey data structures have changed between
library versions.)

And for the benefit of users in the future who accidentally hit this
sort of issue, can anyone recommend a best practices way to downgrade
all packages which are for instance built against libffi8ubuntu1?

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https://bugs.launchpad.net/bugs/1892915

Title:
  gnome-shell crashing (libffi8ubuntu1 upgrade issue)

Status in gnome-shell package in Ubuntu:
  Incomplete
Status in libffi package in Ubuntu:
  Incomplete

Bug description:
  Seeing this on groovy installs after an update.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: gnome-shell 3.36.4-1ubuntu2~build1
  Uname: Linux 5.8.3-050803-generic x86_64
  ApportVersion: 2.20.11-0ubuntu44
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Aug 25 15:49:17 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2019-10-19 (311 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.36.4-1ubuntu2
  ShellJournal:
   -- Logs begin at Tue 2020-06-16 11:50:01 EDT, end at Tue 2020-08-25 15:49:37 EDT. --
   -- No entries --
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2020-08-10T16:14:34.416087

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