There are several ways to find out which release of Ubuntu you’re using. But the most easy way is to make use of the lsb_release (LSB stands for Linux Standard Base) command which pulls it’s info from ‘/etc/lsb-release’. This is a command line utility, so you’ll need to open a Terminal in which you can enter the commands. You can use the -a switch to see all information, as the example below shows. The -h switch will display a list of all possible options.
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 9.04 Release: 9.04 Codename: jaunty $
The lsb_release command does not show what architecture version you’re using. To find this out, you can use the uname command. The next example will show a 64-bit architecture.
$ uname -m x86_64 $
The find you wich kernel release you’re currently using you can issue a uname -r. Use the -a switch if you want all information from the uname command displayed at once.
$ uname -r 2.6.28-11-generic $
See ‘man uname’ for more details on using the uname.