preupgrade procedure incorrectly ask for password after reboot.
it probably happens because i set simple password trough --vnc parameter.
preupgrade-cli --vnc=1 --dhcpd ...
after reboot i connect trougth vnc and got black screen, when i check monitor on my server i got VNC Set password dialog.
As i think my password is weak and preupgrade-cli do not check that restriction. I suggest do not check password weak on boot.
And one featore please support mdns broadcast for --dhcpd mode.
preupgrade-1.1.0pre3 checks for weak VNC passwords. You can get it here to confirm:
*** This bug has been marked as a duplicate of bug 498843 ***