I restored my system getting out of the loop thanks to the ibernate button, which let me delete the start-up application. (next time I will use down arrow in booting step)
Unfortunately I have tried several times to change the xinitrc file adding "#" at the beginning of the last line. It just saids that I have no permissions.
So today I tried to open the xinitrc file by terminal, but with no results.
which is the right way?
brezeler@brezeler-laptop:~$ cd linuxwacom-0.8.5-4
brezeler@brezeler-laptop:~/linuxwacom-0.8.5-4$ sudo -i
[sudo] password for brezeler:
-bash: ./xinitrc.sh: No such file or directory
-bash: ./xinitrc: No such file or directory
root@brezeler-laptop:~# cd /ect/X11/xinit/xinitrc
-bash: cd: /ect/X11/xinit/xinitrc: No such file or directory