I do not issue any guarantee that this will work for you!
1 Preliminary Note
I have tested this on an Ubuntu 11.10 server (host system) with the IP address 192.168.0.100 where I'm logged in as a normal user (user name administrator in this example) instead of as root.
2 Installing VirtualBox
To install VirtualBox 4.1 on our Ubuntu 11.10 server, we open /etc/apt/sources.list...
sudo vi /etc/apt/sources.list
... and add the following line to it:
[...]
deb http://download.virtualbox.org/virtualbox/debian oneiric contrib
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