Run a script upon entering runlevel 2

[Capricorny]

I have found no universal way to do it, and several of the solutions on the net don't work with Knoppix/LXDE.

But, if you run LXDE, there is a relatively inelegant&hard-wired solution, documented on the LXDE Wiki: http://wiki.lxde.org/en/Autostart

Edit the file /etc/xdg/lxsession/LXDE/autostart and add the things you want to have run, prepended with an "@", like @leafpad, and add parameters as needed.
Then it worked for me, at least. Attempts at using only the user's .desktop file didn't succeed for me.

Thank you for the question, I'll need this myself to get virtualization set up automatically.