[Bug 1752362] Re: garbled recovery mode in Simplified Chinese language OS install

[Eric Desrochers]

[VERIFICATION ARTFUL]

I confirmed after having tested friendly-recovery version 0.2.36ubuntu1
for Artful in Recovery mode, that the proposed package default to
English on a Chinese installation where the system variable $LANG is
part of the language blacklist.

(See "Bug attachment" for a screenshot)

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https://bugs.launchpad.net/bugs/1752362

Title:
  garbled recovery mode in Simplified Chinese language OS install

Status in friendly-recovery package in Ubuntu:
  Fix Released
Status in friendly-recovery source package in Xenial:
  Fix Committed
Status in friendly-recovery source package in Artful:
  Fix Committed
Status in friendly-recovery source package in Bionic:
  Fix Released

Bug description:
  [Impact]

  The menu is garbled in recovery mode when using Chinese characters.

  [Test Case]

  1. Install Ubuntu with selected Simplified Chinese language.
  2. Boot to recovery mode.
  3. Most character won't be readable and will appear as black square.
  (See "Bug attachment" for a screenshot)

  [Regression Potential]

  Regression risk is low.

  The fix simply, in Recovery mode only, default the system variables to
  something the console can output when detecting a blacklisted LANG in
  lib/recovery-mode/l10n.sh

  It doesn't affect/modify/change/... the system variables when booting
  in "normal" mode.

  [Other Info]

  Old LP reference :
  https://bugs.launchpad.net/bugs/573502

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