Comment # 4 on bug 956063 from Matthias Sch�nemann

The snapshots get listed okay (there are three kinds, pre, post and extra(?
doing that from memory). There are about a dozen snapshots. I can select any of
them at will (highlighting it) and press enter. 

Then a new menu is displayed, saying something like "If everything works okay,
enter "snapper rollback". Pressing enter here doesn't give any reaction,
nothing more happens. Pressing any key will not have any response, but
<ctrl><alt><del> will initialize a new boot sequence.

Doing nothing, i.e. waiting for a timeout of the progress bar while "If
everything works okay, enter "snapper rollback" is still displayed produces the
black screen with text like "Default as well as alternative entries could not
be booted (in German: "Sowohl die Vorgabe als auch die Alternativeintr�ge
konnten nicht gebootet werden.")

Sorry if my first description wasn't clear. I'll try a screenshot tonight (not
in front of my machine right now) but I'll probably have to take photographs
since I somehow doubt that Grub2 provides a screenshot facility ;-).