I have an Acer notebook with an Intel HD Graphics 5500, and it came with Win10, i decided to install Debian 9 on it. It was and it is a charm to work with, but, there is a graphical issue, my screen has broken horizontal flickering lines which makes viewing a pain. When it boots in the screen is fine but as soon as I see the desktop the lines begin to flicker. Reading some articles i saw that to solve it, just install the driver... Thats the problem, i cannot find it, nor install it from the repository or auto updates, can any good soul help me? Thanks in advance.