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As the subject says, I am curious to know what character-set is used by Ubuntu, is it ASCII or something else like utf-8/utf-16 etc. And if possible how can i change the default character set.

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Not sure if this is what you need but check out system settings / keyboard layout. Here you can change the key set by country – Mark Kirby Aug 10 '12 at 20:00
up vote 2 down vote accepted

Locales customize programs to your language and country. When you installed Ubuntu, you answered some simple questions such as specifying your country and language. Ubuntu used the answers to those questions, in part, to choose a suitable locale for your installation.

The basic functionality is provided by the locale package, which is installed by default. Actual locales are installed separately via the language-pack-* packages.

enter image description here

Most users want a single locale to be used for all aspects of their session. In this case, the GUI provided by System Settings -> Language Support does the right thing.

Below are some of the things that you can do:

  • List installed locales
  • List current settings
  • Changing settings temporarily
  • Changing settings permanently
  • (Re-)Generating locales1

Read On

1Source:Ubuntu Documentations

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