This problem has been addressed on this forum before but I can't make the answer work. Touchpad tapping is not enabled by default, but 'synclient TapButton1=1' from a console at run level 5 enables it. It does not work from run level 2 because that is not a graphical environment. In order to make the change permanent the advice is to go to /etc/X11/Xsession.d and add a file say '15x11-synaptics' with this content : synclient "TapButton1=1". The problem is that the file system is mounted read-only and chmod doesn't work. You can't find the file on the unmounted flash drive. How can you get this line in Xsession.d?