Ubuntu

What Version are you running ?

If available, a great command is the 'lsb_release' command.  This command is part of the Linux Standard Base.

Here is an example of the output from a Unbuntu Linux

bdolango@TestServer:~$ lsb_release -d
Description:    Ubuntu 6.06.1 LTS

That tells you what Linux you are running and the version.  Great command, unfortunally most Linux's don't have something like that.

Note, didn't find that command on a Debian 4.0 system ?

Here is the output if you give it the '-a' option, a little more info

bdolango@briandolangoecke:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 10.10
Release:        10.10
Codename:       maverick
bdolango@briandolangoecke:~$

Here is another example from a RedHat server

[bdolango@pc-t-00 ~]$ lsb_release -a
LSB Version:    :core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 5.6 (Tikanga)
Release:        5.6
Codename:       Tikanga
[bdolango@pc-t-00 ~]$ 

On Debian you can cat the /etc/debian_version

freebirde:~# cat /etc/debian_version
4.0

What version are there ?

https://wiki.ubuntu.com/Releases