Mark Shuttleworth on the future of Ubuntu

Actually the Linux kernel is close enough to what I want: I can write userspace apps using any
license and run them on the Linux kernel. It's like the LGPL in that respect. That is, only if
I want to extend the kernel itself do I have license issues - which is the same situation with
GTK+, which is LGPL.

In other words, that the Linux kernel stays GPL2 doesn't matter to me, unless I want to extend
the kernel itself. Same as with GTK (which is also GPL2 last I checked, and again, it doesn't
matter unless I extend GTK itself).

This is the reason I prefer GTK and the Linux kernel's approach to licensing over Qt's (for
libraries/frameworks, at least. For normal apps, other licenses might be better).