MandrakeSoft did a great job bringing Lithuanian language support
into Linux. I guess, Debian community may largely benefit from what
Mandrake has done: Debian has been carrying quite old Lithuanian
locales for a long time now, maybe somebody could update it?
Here is the link for proper Lithuanian locales RPM:
This RPM has been built by Pablo Saratxaga <firstname.lastname@example.org>,
so probably he may help.