If you are updating from version 1.2.4d0 or earlier in Linux, remove the service file `nqptp.service` from the directory `/lib/systemd/system` (you'll need superuser privileges):
```
# rm /lib/systemd/system/nqptp.service
+# systemctl daemon-reload
```
Don't worry if you get a message stating that the file doesn't exist -- no harm done.