[Users] Compile 3.8.1 under xubuntu 12.04

[seelenhirt]

>   Source URIs are those starting with deb-src instead deb in
>   your /etc/apt/sources.list file. That message means you probably
> have no such lines. Duplicate a "deb ..." lines and change deb by
> deb-src and you should be done. Don't forget to apt-get update after
> changing sources.list.
> 
Or you could use the graphical 'software-properties-gtk' and set the
'Source code' tick.

-- 
I do not think -- therefore I am not.