[Bug 2063361] [NEW] Selecting French at the beginning of installation doesn't change the language for the whole live desktop

[Skia]

*** This bug is a duplicate of bug 2013329 ***
    https://bugs.launchpad.net/bugs/2013329

Public bug reported:

Steps to reproduce:

* Use latest Noble Desktop release candidate: https://cdimage.ubuntu.com/daily-live/20240424/noble-desktop-amd64.iso
* Boot it in a VM.
* Select "Français" in the very first screen of the subiquity installer.
* Now explore the various desktop menus and applications, they are not in french at all.
* Clicking "Suivant" (Next) doesn't change anything, the desktop is still in English.
* Going through to the keyboard layout selection and selecting a french keyboard does changes the layout for the whole desktop.
* Typing `locale` in a terminal reports `LANG=C.UTF-8` and `LANGUAGE=`.

Language is correctly set after installation+reboot.

** Affects: ubuntu-desktop-provision
     Importance: Undecided
         Status: New

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

** Also affects: subiquity (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2063361

Title:
  Selecting French at the beginning of installation doesn't change the
  language for the whole live desktop

Status in ubuntu-desktop-provision:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  Steps to reproduce:

  * Use latest Noble Desktop release candidate: https://cdimage.ubuntu.com/daily-live/20240424/noble-desktop-amd64.iso
  * Boot it in a VM.
  * Select "Français" in the very first screen of the subiquity installer.
  * Now explore the various desktop menus and applications, they are not in french at all.
  * Clicking "Suivant" (Next) doesn't change anything, the desktop is still in English.
  * Going through to the keyboard layout selection and selecting a french keyboard does changes the layout for the whole desktop.
  * Typing `locale` in a terminal reports `LANG=C.UTF-8` and `LANGUAGE=`.

  Language is correctly set after installation+reboot.

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