Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//usr/share/gdm/locale.alias

 # You could insert none UTF-8 locales likes C, ja_JP.eucJP
# The format is language label, space and locale name but 
# the language label is no longer used.
#
# This file will be removed in the future once gdm setup tool is generated.
#
#Unspecified   C,POSIX