and try to install infrastructure and office modules
sounds like it might be if a couple of you have the same.
I have a habit of installing bit by bit but the way you described should work.
Might be a clash of all that stuff going on at once maybe.
I have been evaluting 3.0 and have done a raft of installs over the last two weeks.
I usually pick just the networking.
Set those up and set the domain and in general and just have a look at the networking.
Next is usually firewall and proxy.
enabling as I go.
then through on to samba at the end.
Samba4 RC1 has just been released and the devs are working on that at the moment.
So try just an incremental install for now as I haven't had a problem that way.
Or do a ubuntu clean install as I said earlier and see if that does the same.
I have been using VM quite a lot and bare metal and incremental works.