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[Olivier Tilloy <olivier.tilloy@xxxxxxxxxxxxx>]

/etc/pam.d/gdm-launch-environment is run as user gdm, so it's not what
we're interested in.

/etc/pam.d/gdm-password appears to be what sets the environment upon
user login.

When adding some logging to that module, I'm seeing the following:

pam_env(gdm-password:session): username=ubuntu
pam_env(gdm-password:session): user env path: /home/ubuntu/.pam_environment
pam_env(gdm-password:session): parsing config file
pam_env(gdm-password:session): remove variable "LANGUAGE=fr_FR:en_GB:en"
pam_env(gdm-password:session): remove variable "LANG=fr_FR.UTF-8"

It turns out, "VARIABLE=value" is not the correct syntax for ~/.pam_environment. The expected syntax is "VARIABLE [DEFAULT=[value]] [OVERRIDE=[value]]" (man pam_env.conf).
And indeed if I modify ~/.pam_environment to conform to that syntax, I'm seeing this instead:

pam_env(gdm-password:session): pam_putenv("LANGUAGE=fr_FR:en_GB:en")
pam_env(gdm-password:session): pam_putenv("LANG=fr_FR.UTF-8")

That doesn't seem to fix the overall issue though, as the values of
LANGUAGE and LANG are still those from /etc/default/locale after logging
in.

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https://bugs.launchpad.net/bugs/1662031

Title:
  Switching language and format broken

Status in Ubuntu GNOME:
  New
Status in accountsservice package in Ubuntu:
  New
Status in gdm3 package in Ubuntu:
  Confirmed
Status in gnome-control-center package in Ubuntu:
  New
Status in accountsservice source package in Artful:
  New
Status in gdm3 source package in Artful:
  Confirmed
Status in gnome-control-center source package in Artful:
  New

Bug description:
  In Ubuntu GNOME 16.10 it doesn't matter what display language I select
  - the effective language is still the one stated in
  /etc/default/locale. ~/.pam_environment is changed as expected, but
  the variables set in /etc/default/locale override ~/.pam_environment.

  In Ubuntu GNOME 16.04 language switching takes effect, but the reason
  for that seems to be that /etc/default/locale is changed as well, so
  when a user changes the display language (or format), it changes it
  for all users on the system.

  The overriding by /etc/default/locale is probably caused by some other
  package(s) but g-c-c.

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