Muftasoft TM

Try this, it's worked for me (Lenovo G50-80 i3 Intel graphics):

  Edit the file /etc/default/grub:

  $ sudo nano /etc/default/grub

  Add nouveau.modeset=0 to the line:

  GRUB_CMDLINE_LINUX=""

  i.e. change to:

  GRUB_CMDLINE_LINUX="nouveau.modeset=0"

  Save and close the file.

  Update GRUB:

  $ sudo update-grub

  Reboot.