I'm from Myanmar. At our place we use Shan Language which is related to Thai.
How do I set-up my Ubuntu 12.04 so that I can read and write in my language?
Searching I found the following two packages:
Tai/Shan for iBus my_SHN-ibus-1.4_keymagic_1.5-1_i386.deb will allow you to add Tai languages (=Shan) to ibus.
Tai/Shan fonts for Ubuntu Tai-Fonts-V2.0.0.deb will allow you to read and write shan script
Unfortunately this doesn't solves your problem 100% because ibus doesn't work properly with this package. You can type, but the characters can't be recognised. To solve this problem you could edit the tai-sonla.mim and replace all the "ꪀ" with the right symbols. Maybe someone has a more elegant solutions for this last step.
In the mean time you can also use the fonts in package 2 i.e. A Ying, Kaw Sai, Mongloi, Pang Long, Yunghkio, Tai,X 15-sslm, Ying Ying,Mone Harng Li,Khun jai, MM3 Shan to type shan in applications such as Word and Presentation.
How to install the packages and edit the .mim file:
1 Enable iBus
From Menu, System -> Administration -> Language Support Under "Keyboard input method system" choose ibus
2 Download all the files
3 Open the .deb packages and select "Install"
4 Edit the .mim file with
sudo gedit /usr/share/m17n/tai-sonla.mim
Change all the "ꪀ" or "êª€" with the right tai/shan letters and save the file
You can for example copy them from http://en.wikipedia.org/wiki/Shan_language
5 Add Tai languages i.e. "sonla-kbd" to iBus
From menu, System -> Preferences -> IBus Preferences -> add input method: under the "Tai languages" category, choose "sonla-kbd".
6 Test by opening Word
Choose "Tai languages - sonla-kbd" by clicking on the keyboard symbol on the right top
If you edit the tai-sonla.mim, please share it again here ;-)
currently it seems to be your language was not available here.
You better contact your LOCO team for the support on your Language. Here is the link for you local-language