I know! I always hunted for modems with rockwell UART, that's why I said Multitech is a brand whose modems always worked with Linux. It's an exceptional brand, they never made winmodems. Apart form their old ISA modems, even their PCI and later PCI-E and now USB modems work with Linux. Small but awesome company for modems and VOIP devices.
Gotta say, working for a company that has deployed hundreds of Multitechs (routefinders, etc), I hate, HATE, HATE them as a router when their soldered on battery fails and they dump the entire router configuration, and DHCP stops working. They're fine if the people managing them are intelligent enough to troubleshoot, but horrible when you're reselling them, and expecting them to work for 3-10 years without fail and monitor/repair them remotely. In the last year we had a flood of Multitech Deaths, we have since been replacing them all with standard Cisco RV042 Small Business (aka Linksys) boxes (which also run Linux), much faster/easier to replace. With the exception that their web-admin interface usually only works with IE in the newest firmware on Windows, (Works fine on iPad/Safari, and Mozilla on Redhat).
I skipped to the end of this thread after reading the first two pages.
As far as the OP, and every other *nix contributor. I'm with the opinion, if you like Ubuntu, use it, just remove Unity and install whatever DE/Window Manager you prefer. For my Unix-Derived OS, I prefer FreeBSD w/ Fluxbox, and obviously OS X (I'm one of the few people I know that use Terminal on a daily basis.
). I also run a multi-user VM with 50 RedHat Servers, as well as install RedHat on many IBMs. That's the beauty of any *nix OS. There's a flavor for everyone, it just requires finding a solution that works well, and implementing it. It's been 6 years since I've installed Ubuntu (helped the Distro/Flubuntu put their distro together), but you should still be able to install it how you want at boot.
(As I write this, I'm installing FreeBSD 9 via Boot-only/Netinstall on my Work PC (my company "forces" use of Windows 7, when the majority of your "Phone Support" is 60+ Women, simple is best.)