[Bug 1871268] Re: Installation fails with Could not configure 'libc6:i386'. , E:Could not perform immediate configuration on 'libgcc-s1:i386'

[Tianon Gravi]

I'm running into this building a Docker image that's "FROM ubuntu:20.04"
and just trying to install libc6:i386.  Here's the simplest reproducer
I've come up with:

```
$ docker pull ubuntu:20.04
20.04: Pulling from library/ubuntu
Digest: sha256:cbcf86d7781dbb3a6aa2bcea25403f6b0b443e20b9959165cf52d2cc9608e4b9
Status: Image is up to date for ubuntu:20.04
docker.io/library/ubuntu:20.04

$ docker run --rm ubuntu:20.04 sh -c 'dpkg --add-architecture i386 && apt-get update -qq && apt-get install -y libc6:i386'
Reading package lists...
Building dependency tree...
Reading state information...
The following additional packages will be installed:
  gcc-10-base:i386 libc6 libcrypt1:i386 libgcc-s1:i386 libidn2-0:i386
  libunistring2:i386
Suggested packages:
  glibc-doc locales glibc-doc:i386 locales:i386
The following NEW packages will be installed:
  gcc-10-base:i386 libc6:i386 libcrypt1:i386 libgcc-s1:i386 libidn2-0:i386
  libunistring2:i386
The following packages will be upgraded:
  libc6
1 upgraded, 6 newly installed, 0 to remove and 1 not upgraded.
Need to get 5871 kB of archives.
After this operation, 15.2 MB of additional disk space will be used.
...
Processing triggers for libc-bin (2.31-0ubuntu9) ...
E: Could not configure 'libc6:i386'. 
E: Could not perform immediate configuration on 'libgcc-s1:i386'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)
```

Looking at my GitHub Actions logs, it was working fine two days ago (Sep
21) and was broken starting yesterday (Sep 22), in case that helps
narrow down which uploads might have caused the breakage.

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https://bugs.launchpad.net/bugs/1871268

Title:
  Installation fails with Could not configure 'libc6:i386'. , E:Could
  not perform immediate configuration on 'libgcc-s1:i386'

Status in Ubuntu CD Images:
  Fix Released
Status in glibc package in Ubuntu:
  Invalid
Status in ubiquity package in Ubuntu:
  Invalid
Status in glibc source package in Focal:
  Invalid
Status in ubiquity source package in Focal:
  Invalid

Bug description:
  Test Case 
  1. Install Ubuntu Desktop on hardware with an nVidia card and select to install 3rd party drivers
  2. Proceed with installation

  
  The following error message is displayed in /var/log/syslog
  /plugininstall.py: Verifying downloads ...
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/g/gcc-defaults/gcc_9.3.0-1ubuntu2_amd64.deb: "Version: '9.3.0-1ubuntu2' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxcrypt/libcrypt-dev_4.4.10-10ubuntu4_amd64.deb: "Version: '4.4.10-10ubuntu4' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/g/gcc-defaults/g++_9.3.0-1ubuntu2_amd64.deb: "Version: '9.3.0-1ubuntu2' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/z/zlib/zlib1g_1.2.11.dfsg-2ubuntu1_i386.deb: "Version: '1.2.11.dfsg-2ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxau/libxau6_1.0.9-0ubuntu1_i386.deb: "Version: '1.0.9-0ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxdmcp/libxdmcp6_1.1.3-0ubuntu1_i386.deb: "Version: '1.1.3-0ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libx11/libx11-6_1.6.9-2ubuntu1_i386.deb: "Version: '1.6.9-2ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxext/libxext6_1.3.4-0ubuntu1_i386.deb: "Version: '1.3.4-0ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/l/lm-sensors/libsensors5_3.6.0-2ubuntu1_i386.deb: "Version: '3.6.0-2ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libx11/libx11-xcb1_1.6.9-2ubuntu1_i386.deb: "Version: '1.6.9-2ubuntu1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxdamage/libxdamage1_1.1.5-1_i386.deb: "Version: '1.1.5-1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxfixes/libxfixes3_5.0.3-1_i386.deb: "Version: '5.0.3-1' not found."
  /plugininstall.py: Failed to find package object for /cdrom//pool/main/libx/libxxf86vm/libxxf86vm1_1.1.4-1build1_i386.deb: "Version: '1.1.4-1build1' not found."
  /plugininstall.py: Downloads verified successfully
  ubiquity: Error in function: install
  /plugininstall.py: Exception during installation:
  /plugininstall.py: apt_pkg.Error: E:Could not configure 'libc6:i386'. , E:Could not perform immediate configuration on 'libgcc-s1:i386'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)
  /plugininstall.py: 

  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.9
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CasperVersion: 1.442
  Date: Mon Apr  6 20:17:07 2020
  InstallCmdLine: file=/cdrom/preseed/xubuntu.seed only-ubiquity initrd=/casper/initrd quiet splash ---
  LiveMediaBuild: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
   LANGUAGE=es_EC.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_EC.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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