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Boot from the distro CD you plan to install from, in this case Ubuntu Server, but I also tried this with Xubuntu. Once in the installation environment press Alt-F2. Then press Enter to activate the console. For those who didn't know previously, you can use several other consoles while installing or running Linux for use in recovery or diagnostics. This comes in very handy for snags in the installer, such as this and what I have come to call the "curse of anthy," which is where the installer hangs on installing anthy. Now type
and press Enter. It should think for a second and then finish. If all went well you should be able to press Alt-F1 and get back to the installer. Continue as normal and it should install and leave you with Penguiny Goodness.