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I just mindlessly deactivated my touchpad in Ubuntu 13.04 through the gnome-control-center and have no clue how to activate it again without the use of the touchpad.

Also synclient Touchpadoff=0 doesn't change anything.

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just found the "xinput list" command. will try it now. – stonehaens Aug 21 '13 at 10:10
looked for the device in xinput list and tried to activate it via "xinput set-prop 13 "Device Enabled" 1" ... didn't change anythig. – stonehaens Aug 21 '13 at 10:27
Do you mean re-enabling it from control center doesn’t work? – AliNa Aug 21 '13 at 10:34
:D You could use your keyboard to switch it ON. Know for future: Alt+F10 opens top menus. When you went to System Settings > Mouse and Touchpad, you can use Tab key to select the switch and Space to toggle. However I wonder why xinput didn’t work! – AliNa Aug 21 '13 at 11:02
@AliNa You could post that as an answer. – Eric Carvalho Aug 21 '13 at 11:15

Ok, let’s be presice. If you disable/switch OFF your touchpad through System Settings (Gnome Control Center) you can’t re-enable it with xinput! When you have no other mouse or pointer device, you have to go to System Settings using your keyboard.

Fortunately, Unity is well designed for both keyboard and mouse, so without a mouse you can still do everything. For example, you can press Alt+F10 to open top menu and then navigate to System Settings with arrow keys. Or simply press Super(or ) to open the Dash and search for mouse. Select it with down arrow key () and press Enter to open.

Search for mouse in Dash

Finally using Tab select the Touchpad switch – the orange box around the switch shows that you’re on the right place. Toggle it ON by hitting Space or Enter.

Switch OFF

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