My newely installed Ubuntu on an HP Pavilion G7 is behaving weird in the loading (Booting) process. It sometimes loads from the first time, it sometimes stucks at a purple screen for over 4 minutes. It Sometimes stucks at a black screen and it sometimes loads with a dimmed screen.

There is no way to predict how will the next boot / reboot process behave. It's completely random, searched a lot and checked everything around here, played with the boot options like noacpi, nomodeset.

I am not able to predict what goes wrong especially that sometimes it does load perfectly well. I am currently writing this from a successful boot after 4 unsuccessful trials.

Note: I sometimes get "timeout: killing '/sbin/modprobe" errors with a nonsplash boot.