[Bug 1951399] Re: xubuntu jammy daily fails to install

[Norbert]

If I understand things correctly, then there are two common errors in
logs for Budgie (tracked at bug 1950809), MATE and Xubuntu:

```
xubuntu plugininstall.py: log-output -t ubiquity chroot /target py3compile -p python3 /usr/share/python3/
xubuntu plugininstall.py: log-output -t ubiquity chroot /target mount -t proc proc /proc
xubuntu plugininstall.py: log-output -t ubiquity chroot /target mount -t sysfs sysfs /sys
xubuntu plugininstall.py: log-output -t ubiquity mount --bind /dev /target/dev
xubuntu plugininstall.py: log-output -t ubiquity mount --bind /run /target/run
--> xubuntu ubiquity: /usr/lib/python3/dist-packages/Onboard/LayoutLoaderSVG.py:447: SyntaxWarning: 'str' object is not callable; perhaps you missed a comma?
--> xubuntu ubiquity:   raise Exceptions.LayoutFileError("Unrecognized modifier %s in" \
```

about onboard on Xubuntu and MATE. Does not exist in Kubuntu. Reported
as bug 1951534 .

And

```
xubuntu ubiquity: umount: /target/cdrom: no mount point specified.
xubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom
xubuntu plugininstall.py: log-output -t ubiquity mount --bind /cdrom /target/cdrom
xubuntu ubiquity: chroot: failed to run command ‘tempfile’
xubuntu ubiquity: : No such file or directory
xubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom
xubuntu ubiquity: grep: /target/etc/apt/sources.list: No such file or directory
xubuntu plugininstall.py: Exception during installation:
xubuntu plugininstall.py: Traceback (most recent call last):
xubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 1854, in <module>
xubuntu plugininstall.py:     install.run()
xubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 60, in wrapper
xubuntu plugininstall.py:     func(self)
xubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 188, in run
xubuntu plugininstall.py:     self.configure_apt()
xubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 588, in configure_apt
xubuntu plugininstall.py:     raise install_misc.InstallStepError(
xubuntu plugininstall.py: ubiquity.install_misc.InstallStepError: AptSetup failed with code 127
```

about third-party components installation by Ubiquity. Happens in
Budgie, Kubuntu, Xubuntu and MATE.

The first looks non-fatal, but the second seems to be fatal and possibly
leads to crash.

Waiting for reaction from official Ubiquity developers as soon as
possible.

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https://bugs.launchpad.net/bugs/1951399

Title:
  xubuntu jammy daily fails to install

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Xubuntu daily (jammy) install to
  - hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

  ubiquity failed with crash.

  This installed was attempted because Norbert had mentioned failure to install (using QEMU)
  - https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1951305
  - https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1951309
  - https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1951312

  This install was an old BIOS box

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubiquity 21.10.10
  ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
  Uname: Linux 5.13.0-19-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu73
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.465
  Date: Thu Nov 18 19:36:21 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Xubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20211118)
  ProcEnviron:
   LANGUAGE=en_AU.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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