UbuntuHelp:CheckingYourUbuntuVersion

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https://help.ubuntu.com/community/CheckingYourUbuntuVersion

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1. title Checking which version of Ubuntu you have

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.