As davixt3 said, installing xserver-xorg disables clicking with the
touchpad. You can still move the cursor with the touchpad, but you have
to use the buttons below the touchpad to click.
To fix the touchpad issue open dconf-editor and go to /org/gnome
/settings-daemon/peripherals/touchpad and set
My default setting in "System Settings" > "Software & Updates" > "Ubuntu
Software" > "Download from" is "Server for Germany"
(de.archive.ubuntu.com). Updating apt I got:
W: Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/trusty-
updates/universe/i18n/Translation-en Hash Sum mismatch
E
