I'm using the Desktop version of Ubuntu 14.04.1. I started up the liveCD, installed mdadm, and created a RAID 1 array on a 3 TB HD. I then restarted, went directly into the installation menu, and set up a new installation with / and swap on two partitions on the SSD, and /home on the RAID 1 array.
The installer seemed to have no problems with this arrangement, but upon restarting into the new installation, I'm told that "The disk drive /home is not ready yet".
My first thought was that perhaps mdadm wasn't installed on the new system, so it had no way to read the drive, but I can't imagine Ubuntu installer would recognize and install to a RAID array without including the necessary packages to read said array. I'm not sure how to go about diagnosing this - any ideas?
Edit: After discovering that my new installation didn't have mdadm installed on it for whatever reason, I restarted and used the manual recovery mode to get to a root terminal. It seems like it would be possible to install mdadm from here, but I can't get an internet connection to work. I used "ifconfig eth0 up" to activate the ethernet, and tried pinging with and without lo disabled, but can't seem to get a connection to stick.