...knew that... ok, reinstalled the whole system - like in latest tries, system automatically set eth1 as outside, no matter how the cables were... Then, in the web interface, i swapped the interfaces, changed the cables, everything runs ok.
Then, i run "sudo /usr/pluto/bin/Diskless_CreateTBZ.sh"... in the end, that "Mythtv" problem with broken packages stil repeats himself, until I end it with Ctrl-C.
Then, i try to run network install of the MD, but that error "Unable to locate configuration file" still stops the process...
Now I'm really clueless...