Ubuntu 14.04 was working fine for a few weeks after installation, detecting USB wireless Microsoft all-in-one keyboard/touchpad. Then it stopped, at least after boot-up.
Keys work before boot-up to input passwords, touchpad moves mouse pointer after boot-up, but clicking is impossible, and no typed keystrokes are registered, so I cannot open a Terminal window.
If I unplug and replug the mouse, it stops working altogether. I've tried other non-wireless mice and Logitech keyboards, but they don't work either.
Starting from Recovery is the same thing. The keyboard works fine before boot-up, so I am trying to get to a Command line from Recovery. Dropping to root shell prompt leaves me with read-only files, and I can't operate commands.
repair broken packages (dpkg), I thought should take me to a Command line, but it always runs through to 98%, then freezes for hours until I have to force restart (holding the power button down, which I know is a bad thing).
What other ways are there to get to a Command line?