Can't set different locale for LC_MESSAGES via /etc/default/locale

[rltas]

cmd /c ver

Microsoft Windows [Version 10.0.22000.1098]

wsl --status

Standard-Distribution: Ubuntu-22.04
Standardversion: 2

Did the problem occur during installation?

• Yes

What happened?

When setting a different locale for LC_MESSAGES in /etc/default/locale, it's never applied.

$ locale
LANG=de_DE.UTF-8
LANGUAGE=
LC_CTYPE="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_PAPER="de_DE.UTF-8"
LC_NAME="de_DE.UTF-8"
LC_ADDRESS="de_DE.UTF-8"
LC_TELEPHONE="de_DE.UTF-8"
LC_MEASUREMENT="de_DE.UTF-8"
LC_IDENTIFICATION="de_DE.UTF-8"
LC_ALL=

What was expected?

The expected outcome would be:

$ locale
LANG=de_DE.UTF-8
LANGUAGE=
LC_CTYPE="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="de_DE.UTF-8"
LC_NAME="de_DE.UTF-8"
LC_ADDRESS="de_DE.UTF-8"
LC_TELEPHONE="de_DE.UTF-8"
LC_MEASUREMENT="de_DE.UTF-8"
LC_IDENTIFICATION="de_DE.UTF-8"
LC_ALL=

This works on my regular Ubuntu hosts, but not in my WSL instances (both 20.04 and 22.04).

Steps to reproduce

$ sudo locale-gen de_DE.UTF-8

$ locale -a
C
C.UTF-8
de_DE.utf8
en_US.utf8
POSIX

$ sudo update-locale LANG=de_DE.UTF-8 LC_MESSAGES=en_US.UTF-8

$ source /etc/default/locale

$ locale
LANG=de_DE.UTF-8
LANGUAGE=
LC_CTYPE="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_PAPER="de_DE.UTF-8"
LC_NAME="de_DE.UTF-8"
LC_ADDRESS="de_DE.UTF-8"
LC_TELEPHONE="de_DE.UTF-8"
LC_MEASUREMENT="de_DE.UTF-8"
LC_IDENTIFICATION="de_DE.UTF-8"
LC_ALL=

Restarting the whole instance or interchanging UTF-8 and utf8 doesn't affect the outcome.

Additional information

No response

[jibel]

Thanks for your report. Confirmed on the latest update of 22.04.