Installed 16.04 fresh on a new drive yesterday. Everything worked fine, from installation to normal usage, even the touchpad with gestures and all. Today I was trying to boot a live USB with another distro (Backbox) to install alongside Xenial, but had some problems due to graphics and/or touchpad drivers missing.
After that, suddenly the touchpad stopped working in Ubuntu as well, not even a cursor. A USB mouse works. I've tried every "solution" Google can find, I think, including:
modprobe -r psmouse && modprobe psmouse proto=imps
dconf(as in the answer here: https://askubuntu.com/a/369229/40894)
F10(toggle touchpad) -> touchpad is not even available in System Settings
i8042.reset i8042.nomux i8042.nopnp i8042.noloopto grub boot options (https://askubuntu.com/a/528429/40894)
- Forcing insecure boot (
sudo mokutil --enable-validation) -> this made the touchpad work only as a PS/2 mouse (for a while)
Even a newly downloaded ISO (today) won't boot the installation program with touchpad recognised. Why would it work yesterday and this morning and suddenly stop working? I'm hesitant to file a bug report since I don't know yet why it just stopped working.
The system setup:
- XMG C404 (Gigabyte P34Gv2 motherboard)
- ELAN touchpad
- Nvidia GTX 860M
- Dual-booting Windows 10 (separate drive)