Andrei's questions

I'm having problem booting up my ubuntu 16.04.
I started up my computer today and my login screen looked like something out of the 90's (A 256 color looking square box asking for login and password).
After entering my login and password, the wallpaper showed up but nothing else. I tried running the command startx in the tty but I got an error message.
After rebooting a few times, a message box started showing up before login, saying "The system is running in low-graphics mode" and stating that my graphics card could not be detected correctly. After this box, another one shows up asking me what I'd like to do, but I can't get pass this one since I don't have the mouse on screen.
My graphics card is an intel HD 3000.
Does anyone knows how to solve this problem?

I'm new to Linux systems in general (I'm using Ubuntu 16.04 LTS) and I'm having difficulty in changing the brightness of my notebook.

When I use the Fn+F8 or Fn+F9 the brightness bar shows up but there is no change in the actual brightness of the screen.

I tried every method described in this post (How to adjust screen brightness in Ubuntu 14.04?) to no success. Installing and using the xbacklight has no effect, same for editing the brightness file in the "intel_backlight" file.

Anyone knows how to solve this?