[Bug 1903378] Re: ubiquity in live session and ubiquity-dm fails to start

[Jean-Baptiste Lallement]

kde_ui.py fails to load due to this error:
Ubiquity 21.04.1
Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 667, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 653, in main
    install(query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 253, in install
    ui = importlib.import_module('ubiquity.frontend.%s' % f)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 40, in <module>
    import sip
ModuleNotFoundError: No module named 'sip'

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https://bugs.launchpad.net/bugs/1903378

Title:
  ubiquity in live session and ubiquity-dm fails to start

Status in ubiquity package in Ubuntu:
  Confirmed
Status in ubiquity source package in Hirsute:
  Confirmed

Bug description:
  Intending to explore an unrelated issue with sddm/video-graphics
  (https://bugs.launchpad.net/bugs/1895905) I booted the current hirsute
  daily on

  dell [optiplex] 990 (i7-2600, 16gb, nvidia geforce gt 6600 gt)

  No "Try Kubuntu" or "Install Kubuntu" dialog appeared, instead I got

  "Installation failed - KDialog \n
   The installer encountered an unrecoverable error.
   A desktop session will now be run so that you may
   investigate the problem or try installing again"

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: kubuntu-desktop 1.398
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  ApportVersion: 2.20.11-0ubuntu51
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.455
  CurrentDesktop: KDE
  Date: Sat Nov  7 08:03:17 2020
  LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201106)
  SourcePackage: kubuntu-meta
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu51
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.455
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 21.04
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201106)
  Package: ubiquity 20.10.13
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Tags:  hirsute ubiquity-20.10.13 kubuntu
  Uname: Linux 5.8.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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