In the last years the Linux OSes did improve a lot regarding a desktop user's point of view. Especially since Ubuntu released its first version things became better and better.
My question is:
What are the most annoying (remaining) problems of Linux Desktop OSes in your opinion? One could also ask: What tools or libraries are missing?
When I started using Linux the problems were missing software, hardware as a whole, missing graphical configuration utilities, ugly fonts, mounting of external devices, bad software, bad browsers... Most of these seem fixed, but which problems remain?