[Bug 1954713] [NEW] Ubuntu Server 20.04.3 (manual / autoinstall) language pack not installed despite chosen language

[Flauschie]

Public bug reported:

During a manual or autoinstall the defined language is not being applied
completely to the final system state. Despite `locale` showing the
configured language, all console replies are still in the installers
native language.

Another confirmation: Using autoinstall and applying the `ubuntu-
desktop` package, using Settings -> `Region & Language` the Language and
Formats fields are completely empty.

Though the locale is being set properly, the language pack is not being
installed nor applied.

Missing packages: `language-pack-LANG` and `language-pack-LANG-base`
Missing packages in case of desktop package: Everything related to get everything in the desired language`

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1954713

Title:
  Ubuntu Server 20.04.3 (manual / autoinstall) language pack not
  installed despite chosen language

Status in subiquity package in Ubuntu:
  New

Bug description:
  During a manual or autoinstall the defined language is not being
  applied completely to the final system state. Despite `locale` showing
  the configured language, all console replies are still in the
  installers native language.

  Another confirmation: Using autoinstall and applying the `ubuntu-
  desktop` package, using Settings -> `Region & Language` the Language
  and Formats fields are completely empty.

  Though the locale is being set properly, the language pack is not
  being installed nor applied.

  Missing packages: `language-pack-LANG` and `language-pack-LANG-base`
  Missing packages in case of desktop package: Everything related to get everything in the desired language`

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