Some more information is needed man. What version/distro are you running? Have you tried plugging them in and seeing if they work? I know that 11.10 and up has issues with mouse and keyboards via usa, but it could be a BUNCH of different things. 
Edit: My bad didnt see in your title that you were running the latest lts.
Typically it is a simple fix for this. I was able to create this error on 12.04 32-bit Where my mouse was not functioning. Keyboard i am unable to imitate.
Terminal it up 
This will show you if your key strokes and mouse movements are being detected. If not try this.
For me returned this
Code:
elliott@elliott-desktop:~$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Mad Catz Mad Catz R.A.T.7 Mouse id=8 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Power Button id=7 [slave keyboard (3)]
↳ G19 Gaming Keyboard id=9 [slave keyboard (3)]
↳ G19 Gaming Keyboard id=10 [slave keyboard (3)]
↳ Logitech G19 Gaming Keyboard id=11 [slave keyboard (3)]
seeing that you can restart things from here.
example. To fix the mouse not working at all or onlyin being able to move and not click (left or right) i input
Code:
xinput reattach 8 2
where the first number is the device youd like to re attached and the second number is the master selection.
Hope i helped
Spilled the Beans
Originally Posted by 1337_snic
Some more information is needed man. What version/distro are you running? Have you tried plugging them in and seeing if they work? I know that 11.10 and up has issues with mouse and keyboards via usa, but it could be a BUNCH of different things.
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