Canonical wants Ubuntu Linux to run on a range of devices -- from mobile Internet devices all the way up to high-end servers and cloud systems. But there are two markets where Canonical has no plans to push Ubuntu. Here they are.

During a recent phone briefing with The VAR Guy about ISV support, Canonical's Steve George (director of corporate services) said the company had no plans to push Ubuntu for realtime solutions and mainframes. Is that a surprising statement? Certainly not. But it does help to clarify exactly where Canonical plans to promote Ubuntu as version 10.04 (Lucid Lynx) nears launch.

Sure, the official Ubuntu Wiki briefly mentions realtime Ubuntu. But that's about it. And on the mainframe front, Novell's SUSE Linux is a widely known option. Similarly, Red Hat Enterprise Linux has found a home on IBM mainframes.

Canonical is taking a slightly more targeted view of the world. The forthcoming Ubuntu 10.04 Long Term Support (LTS) release will emphasize netbook, notebook, desktop, server and cloud offerings. And yes, Canonical is preparing to aggressively promote Ubuntu 10.04 to ISVs (independent software vendors), particularly on the server.

Still, Canonical is stretched pretty thin these days. In additional to Ubuntu 10.04, the company is preparing another Landscape update -- to help IT managers and channel partners remotely maintain Ubuntu deployments. And online services -- such as the Ubuntu One storage service and Ubuntu One Music Store -- continue to take shape.

Apparently, there's neither time nor customer demand for Canonical to stretch Ubuntu even further into alternative markets like realtime Linux and mainframes.