SDB:YaST lock files

You can't use software install because "an other yast session is running", but there are none.

Chance is you crashed or broke your X session (Ctrl Alt bckspace) during Yast session using the rpm database.

Yast creates lock files not in /var/lock as usual but in /tmp. Search for "yast*" and remove the files found in /tmp don't do this if a Yast session is really running!. (tested on 10.2).