This is a short guide on how to change charset in Debian and Ubuntu. I myself have done this in Debian. The guide demonstrates the use of the text-based wizard which can be used from the terminal. There are probably a graphical tool for doing the same thing but they are not discussed here.
Start by running the following command as root user:
Choose which charsets you want from the list. You check or uncheck by pressing [Space]. Figure 1 shows an example of how it might look like.
In the next step, you choose a charset from those you selected to use by default in your system. Figure 2 shows an example of how it might look like.
In order for your changes to take effect, restart the terminal. If you use a terminal in a graphical environment, it may be enough to simply close it down and open a new one. If you’re in a CLI, you probably need to log off and log back in for it to take effect.