I've just installed Lubuntu 14 on an older machine (Dell Optiplex 780). Everything works fine on the live-USB drive, installation etc. When the machine boots to the newly installed operating system, neither the keyboard nor mouse work. I've ruled out the following:
- I have tried all USB ports.
- I have tried both an HP and apple keyboard, and a logitech mouse.
- Re-plugging the devices in after boot does not help.
- Toggeling BIOS compatibility flags does not resolve the issue
- All USB ports are enabled in the BIOS.
- Machine is not frozen, it can respond to the power button and goes to sleep after a defined period.
- The machine is not using USB3.0 ports
- Linux Mint and Ubuntu install without issue
The following reports are similar:
- Installing ubuntu 14 LTS : keyboard and mouse do not function (never resolved)
- After doing a fresh install of Ubuntu 13.10 my USB Keyboard and mouse won't work (never resolved)
- http://forums.whirlpool.net.au/forum-replies.cfm?t=2170773 (never resolved)
- http://ubuntuforums.org/showthread.php?t=1264128 is for a different desktop environment, and for a different problem, but is possibly related
It is unlikely to be identical to bug 1244176 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1244176 because it does not occur during install.
Workaround: install Linux Mint
Edit: it occurs to me that the images I'm using to install are retrieved from unetbootin on OSX. They may not be current. I will try a different image tomorrow.
Edit: There are far worse problems now. The system is sporadically not booting, refusing to boot from live-USB, and sometimes keyboards aren't even working in the BIOS. I am giving up. Something is terribly wrong.