Updated service file

Setup-Service-on-Linux.md

@@ -2,6 +2,10 @@
 
 If you want to get Calibre-Web started automatically after reboot follow this instructions. Create a file `cps.service` as root in the folder /etc/systemd/system with the following content:
 
+Replace the elements in `{}` like User, ExecStart and WorkingDirectory with your username and file- and foldernames.
+
+### Installation from source
+
 ```
 [Unit]
 Description=Calibre-Web
@@ -16,7 +20,25 @@ WorkingDirectory={/PATH/OF/CPS.PY without cps.py}
 WantedBy=multi-user.target
 ```
 
-Replace the elements in `{}` like User, ExecStart and WorkingDirectory with your username and file- and foldernames.
+### Installation via pip
+
+Find the location of the calibre-web starterfile `cps`, this should be something like `/home/<user>/.local/bin/cps`. 
+Another option is using `{path to correct pythoninstance} -m cps` as starterfile. The correct python instance depends on how you installed calibre-web (e.g. virtual environment, system interpreter)
+
+```
+[Unit]
+Description=Calibre-Web
+
+[Service]
+Type=simple
+User={Username}
+ExecStart={path to starterfile}
+
+[Install]
+WantedBy=multi-user.target
+```
+
+### Start Service
 
 `sudo systemctl enable cps.service`