Yast/Tips/rpm lock files

From openSUSE

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 fils found in /tmp don't do this if a Yast session is really runing!. (tested on 10.2).