Nautilus won't launch in Ubuntu 15.04. What should I do?

After killing all nautilus proccesses, the problem is fixed for me:

$ killall nautilus

It is not a great soution either but it is easier than reboot :)

Got the same problem (today), with the same output with nautilus -c. And as far as I know, nothing to do with nautilus-scripts.

Tried to logout, which seemed to be wrong solution. As I tried to login again, all I got was nice ubuntu background image and mouse cursor. No launcher, no top bar.

Then: CTRL+ALT+F1 (at least this worked), did login and then sudo reboot.

After reboot & login everything seems to work normally (although I got some problems with NAS NFS mounts during shutdown and restart, but I think that's another problem - probably with systemd).

Somehow this reminds me of Windows and Explorer... maybe someone knows how to handle this without reboot (I wouldn't accept reboot as a solution).