Hi,
A workaround for this bug is:
Start the machine from scratch with all the USB devices plugged in.
Wait for the Grub menu to show on the screen.
Using the keyboard select Ubuntu as the operating system to load.
Right after selecting the Ubuntu OS, disconnect the USB mouse (be it direct USB 
plug-in or remote).
When the Ubuntu login screen comes up it will be possible to use the keyboard 
to enter the user-name and the password.
Once the Ubuntu environment is established, reconnect the USB mouse., and use 
it normally.
Problem solved, although a bit annoying.
Hope this helps.

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https://bugs.launchpad.net/bugs/1450989

Title:
  USB attached keyboard and mouse don't work at the login time to Ubuntu
  Trusty Tahr 64 bit

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