There is always a time when your GNU/Linux machine's screen output stops working. Maybe it's displaying garbage to your monitor instead of Gnome or KDE. Or maybe it's displaying 640x480 resolution with 8 colors instead of 1280x1024 with 24 colors. Actually, this will happen with Windows as well. But unlike Windows, GNU/Linux provides a handy tool to fix it.
Read more »How to fix your computer's graphics with dpkg-reconfigure
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