Default ubuntu to boot in startup manager causes ubuntu to not work anymore I have installed ubuntu alongside os x. I can start it by pressing the option key during startup and choose the correct disk. Everything works.

Now I want to default the ubuntu disk. That works by pressing "Control" while choosing the disk in the startup manager and pressing enter.

My mac now boots default to ubuntu. But it does not work anymore. The login screen appears, but neither keyboard nor touchpad work. Also if I plug in an usb mouse, it does not light up.
A couple of things to check:


reset your NVRAM since the startup disk is stored there
set the desired startup disk from OS X (or by blessing it manually from OS X) after the NVRAM clear
use a third party boot manager - Boot Runner is about the best there is, but you have lots of options from free to open-source