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

[exploiTED]

The installation finished successfully with no internet connection and
no 3rd party software installed but the system doesn't boot to grub
(different from this bug report but an update to the installation
nonetheless).

Details again: 
Device Information:
Dell G5 15 5587
Service Tag: B9WHYQ2
Graphics: NVIDIA GeForce GTX1050 Ti
16gb ram
128gb NAND SSD
1TB SSD

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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 apt package in Ubuntu:
  Confirmed
Status in glibc package in Ubuntu:
  Invalid
Status in ubiquity package in Ubuntu:
  Invalid
Status in apt source package in Bionic:
  Invalid
Status in glibc source package in Bionic:
  Fix Released
Status in ubiquity source package in Bionic:
  Invalid
Status in apt source package in Focal:
  Confirmed
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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