Always update apt-get:
$ sudo apt-get update
Install matchbox-keyboard:
$ sudo apt-get install matchbox-keyboard
Then, you can open the matchbox-keyboard by enter:
$ matchbox-keyboard
Noch ein Shellscript auf den Desktop packen:
#!/bin/bash matchbox-keyboard
Quelle:
http://helloraspberrypi.blogspot.de/2017/05/install-virtual-keyboard-on-raspberry.html