default /etc/network/interfaces

[Mihamina Rakotomandimby]

Hi,
What is the default "interfaces" content, in xubuntu, in order to 
restore it?
Because I've put the mess in it.
I would like it to be compliant with the graphical "network manager" in 
xubuntu.

PS: what is the "network manager" in xubuntu? I mean the name of the 
package...