Comment 5 for bug 547091

I have a similar problem on Ubuntu precise after I upgraded to 2.0.873-3ubuntu5~ubuntu12.04.1 from backports. Before it worked well with 2.0.871-0ubuntu9.12.04.2 and 2.0.871-0ubuntu9

The error message at boot time is not exact the same, given a newer distro, but the problem is the same: the iscsi device is not connected yet, One is then given the choice to (s)kip mounting or (M)anual recovery.

Pressing S resumes booting. The first message that briefly appears afther that is the startup of the open-iscsi daemon....
When logging in and issuing mount -a the device gets mounted without further problem.

For sake of completeness, our fstab does have the _netdev option.