Ubuntu 11.10 in VirtualBox "mountall: Disconnected from Plymouth" error

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http://askubuntu.com – I installed Ubuntu (from the 11.10 Alternate CD, selecting "command-line only" mode before installing) in Virtualbox (Mac OS X Lion host) like I've done numerous times before. Installation finished without any problems, and I rebooted into my new system. Got the splash screen, it loaded, and right where it should've given me a login prompt, I got (in orange) mountall: Disconnected from Plymouth. I can just hit control + alt (option) + F1 to get the login prompt on tty1, and the system acts normally. This happens on every boot. The disk has two partitions, a 250 MB /boot partition and a 99.75 (HowTos)