[Bug 1892825] [NEW] update-locale not perform correctly sanity checks

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Gunnar Hjalmarsson (gunnarhj):

By passing wrong input as following:
 sudo update-locale LANGUAGE = en_US.UTF-8
result is:
...
#LANGUAGE=en
=

This "equal" sign that was added makes system completely unusable(can't
run sudo anymore):

bentzy at bentzy-nb:~$ sudo vim /etc/default/locale 
sudo: pam_open_session: Bad item passed to pam_*_item()
sudo: policy plugin failed session initialization

Fixed it booting from installation disk and fixing corrupted
/etc/default/locale

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: locales 2.31-0ubuntu9
Uname: Linux 5.5.4-050504-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Tue Aug 25 09:36:03 2020
InstallationDate: Installed on 2020-08-17 (7 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: glibc (Ubuntu)
     Importance: Medium
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress


** Tags: amd64 apport-bug focal
-- 
update-locale not perform correctly sanity checks
https://bugs.launchpad.net/bugs/1892825
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