First make sure your library language is installed
sudo apt-get install language-pack-en-base, for example.
Then, as superuser, shorten the work by allowing Ubuntu to automatically configure them:
sudo dpkg-reconfigure locales
Check your setup, if it's correct then good. But if you have the
LANGUAGE= settings blank, run this in command line:
Which generates the locales installed and available to you.
Choose the locale from the output generated that fits your situation, and export that setting to replace your locales, for example:
For manual installation use
export to set locale by hand which will manually install custom locales, first run the set up as above.
Then, say you want to install
"en_us-8" for language but have need for another locale for
TIME, you may wish to use
"en_NZ.utf-8" (remember: these are case-sensitive) or
NUMERIC="en.dk.ISO-8859-15". Traveling to New Zealand, I could change the locale
LANGUAGE="en.NZ". For Germany, I would just need to install the locales pkg for it and input, in terminal, like the examples below:
LC_ALL= may remain empty.