To check which version of Ubuntu you are running, click System -> About Ubuntu. The first line of the page that loads will tell you the version number, for example Ubuntu 10.04 LTS.

Check the list of Ubuntu versions to see how old your version is and whether an upgrade is available.

Checking with the command line

To check your Ubuntu version using the command line:

1. Open a Terminal (Applications -> Accessories -> Terminal).

2. Type cat /etc/issue and press Enter.

3. The Ubuntu version will be displayed on the screen.