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

[bs]

Public bug reported:

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: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1892825

Title:
  update-locale not perform correctly sanity checks

Status in glibc package in Ubuntu:
  New

Bug description:
  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)

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