I tried installing the 64-bit 13.04 Ubuntu server on a fairly generic superMicro box with dual OCZ SSD's I plan to software RAID. The install failed with a "Unable to install busybox-initramfs" message. This appears to be a bug documented on launchpad. (I got the same error message even when ignoring the second SSD.)
I checked console 4 for details:
apt-install or in-target is already running, so you cannot run either of them again until the other instance finishes. You may be able to use `chroot /target ...` instead. in-target: Unexpected error; command not executed: `sh -c debconf-apt-progress --no-progress --logstderr -- apt-get -q -y --no-remove install busybox-initramfs`
I'm not sure what to do with this error message without sifting through the installer code, but the person who reported the bug originally on launchpad suggested that he found a workaround by "preseeding the installation with linux-server". Does anyone have any idea what this means / how to do this?