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

[Flauschie]

I am coming from Ubuntu 18 netboot/server image and in my d-i setup i
defined the language and also the desktop-package and everything got
applied.

Sorry, but I am confused right here. Don't get me wrong, but if I am
able to chose the language, within the installer and it doesn't get
applied at all (and is just a visual thing during the installer), there
is something working wrong as I would expect this to be installed. Maybe
I'm the only person on this. But if nothing gets installed I don't need
a different installer language available.

There is also no hint that the language selection on the very first
screen is only for the installer itself. So I would definitely assume
that this will be applied properly, everywhere.

I resorted to manually install the packages mentioned above. How to
properly use `check-language-support`, can I use this in packages as an
extra line per `check-language-support -l LANG` ?

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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:
  New
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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