Un altre tema que fa temps que cueja, el LightDM que ve per defecte no honora els locales que es seleccionen a la interfície del greeter. LxDM ho fa correctament.
Fa temps ho havia mig solventat amb un fitxer a /etc/X11/Xsession.d/39-lightdm-dmrc-fix
#!/bin/bash
# workaround for session language selection in lightdm greeter
# use .dmrc or accountsservice data (if accounts-daemon is running)
# we need this only if lightdm is being used
if pidof lightdm
then
# if accountsservice is used, get info from there.
if pidof accounts-daemon
then
LANGFILE="/var/lib/AccountsService/users/$USER"
# if not, use .dmrc
else
LANGFILE="$HOME/.dmrc"
fi
# extract, fix and export $LANG
TEMPLANG=$(cat "$LANGFILE" | grep ^Language= | cut -d '=' -f 2 | sed 's/utf8/UTF8/')
[ ! -z "$TEMPLANG" ] && export LANG=$TEMPLANG
# convert $LANG to $LANGUAGE and export
TEMPLANGUAGE="$(echo $LANG | cut -d '@' -f 1 | cut -d '.' -f 1):$(echo $LANG | cut -d '@' -f 1 | cut -d '.' -f 1 | cut -d '_' -f 1)"
[ ! -z "$TEMPLANGUAGE" ] && export LANGUAGE=$TEMPLANGUAGE
fi