I recently bought a new lenovo B50-10 notebook on which I've installed ubuntu 15.10 successfully, at least I thought so until I stumbled upon a troublesome issue : my notebook won't shut down. Every time I would try to shut down the purple-ish screen with the ubuntu logo and the little dots would come out as usual but it will freeze after 2 dots turned orange. Before this I had a different problem : shutting down would only make the screen black( not switched off) and the fan and the powerlight would still be on; after reinstalling ubuntu it changed to the freezing problem I mentioned above. this is a cry for help, the problem it's really bugging me out and I fear having to continuously use the power button to force power off may damage my notebook on the long run. thanks to anyone who would be so kind to help.
p.s. I've already tried several solutions like modifying grub file and update it, bios reboot, etc. basically anything I found on the web. the pc also won't reboot but it will standby/hybernate correctly