Debian GNU/Linux
Installed using Lenny (stable) and want to use unstable (sid)?
/etc/apt/sources.list
Replace lenny or stable with sid
Manually update
aptitude update && aptitude safe-upgrade
Check distribution info:
cat /etc/debian_version squeeze/sid
root@debian:~# cat /etc/issue Debian GNU/Linux squeeze/sid \n \l{
root@debian:~# lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux unstable (sid) Release: unstable Codename: sid
Remove old kernel, Debian will remove the folder in /lib/modules but Ubuntu does not.