I have an installation of LTS 12.04 and Vbox, all updated as and when required. I have a choice of six desktops,
KDE Plasma Workspace
I normally use *Ubuntu* but decided I needed a change and tried the others and I found this difference.
Booting into any of the other Desktops except Ubuntu and Ubuntu2D does not bring up *pan1* in my network so my Vbox connections fail on this.
If I boot into either of the Ubuntu choices then change over to another Desktop *pan1* is there.
OK, I know to change the interface and everything works, I'm just interested in where I have gone wrong with the configuration.
( I found that using *pan1* made it easy to SSH to and from Vbox )