http://tedjonesweb.blogspot.co.uk/2013/06/crypto-messaging-peer-to-peer-protocol.html
cd $HOME/PyBitmessage/src/ && nohup python ./bitmessagemain.py
If you want to start Bitmessage automatically when you login, make a new file into your ~/.config/autostart/ directory:
$ gedit $HOME/.config/autostart/bitmessage.desktop
[Desktop Entry] Type=Application Exec=nohup python /home/youruserfoler/PyBitmessage/src/bitmessagemain.py Hidden=false NoDisplay=false X-GNOME-Autostart-enabled=true Name=Bitmessage gedit $HOME/Desktop/bitmessage.desktop Then you should click on the new icon with the right mouse button, select "Properties", click on "Permissions" and mark "[x] Allow executing file as program".