- Nautilus. Serious usability/UX problems.
- Audio in linux. Ubuntu often selects the wrong audio devices (microphone, headphones, speakers)
- Linux sleep/hibernation. System hangs are common.
- GRUB. The interface is dated, why is it so ugly?
A feature I found in Nautilus the other day is (ctrl + L) allows you to edit the current directory path..... Had no idea this was possible, but hugely beneficial.