[Bug 1880277] Re: Ubiquity crashes on while installing Ubuntu 20.04

[Cubic PPA]

*** This bug is a duplicate of bug 1880344 ***
    https://bugs.launchpad.net/bugs/1880344

The issue was because the customized filesystem.squashfs was missing the /proc and /tmp directories.
Ubiquity expects these directories to be present, because they are not automatically created during the installation process.
Including empty /proc and /tmp (and /run) directories solved the problem.

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https://bugs.launchpad.net/bugs/1880277

Title:
  Ubiquity crashes on while installing Ubuntu 20.04

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Ubiquity crashes on while installing Ubuntu 20.04

  Options selected:
  ~ Normal install
  ~ Do not download updates
  ~ Something else
  ~ Selected install partition, efi partition, and mount points for two additional partitions
  ~ All partitions were ext4 (except efi partition)

  Ubiquity crashed when the install was almost complete.

  Ubiquity displayed "Configuring apt" expander.

  The following output was visible on the terminal window below the
  expander:

  May 23 02:08:10 ubuntu /plugininstall.py:
  ubiquity.install_misc.InstallStepError: AptSetup failed with code 1

  May 23 02:08:10 ubuntu /plugininstall.py

  /usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:17: Warning: Source ID 8302 was not found when attempting to remove it
    GLib.source_remove(self.timeout_id)

  /usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:133: Warning: Source ID 8475 was not found when attempting to remove it
    GLib.source_remove(self.rows_changed_id)

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.15
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.445
  Date: Sat May 23 02:09:41 2020
  InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu.iso noprompt noeject
  LiveMediaBuild: Ubuntu 20.04.0 2020.05.23 LTS "Custom Focal Fossa" (20200523)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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