Ulff,

I lost the thread already, sorry, but just in case you didn't know. Yuo 
probably have to debug this in 'single user mode' which you can get by grub, if 
the grub menu displays at all. (Try hitting escape, then chose 'advanced 
options' or maybe 'e' for edit to see the options).

Lookup the 'linux' line. Booting the 'single' entry, you hopefully get a root 
console. Now you can lookup the graphic card via 'lspci -v' (maybe send us the 
result) and you can install packages with apt-get. If you know how to use 
aptitude, install and use this.

If you install the meta-package xorg-driver-video then xorg will try to chose 
the best guess as driver. There are fallbacks like VESA framebuffer, so at 
least something should work.

Do 'less /etc/X11/xorg.conf' to see if there's a driver preconfigured. Maybe 
disable that by renaming the file so something like xorg.conf-suspendet and 
relaunch X. (Xorg doesn't need this file, it figures things out by itself, but 
you still can place 'override' defaults here)

by the way, if you need more extensive debugging you should temporarily disable 
the login manager (lightgdm or kdm or so) from the boot scripts. Today that's 
done via systemd 'systemctl' but i can't tell you exactly how, since i'm not 
using that init system. Without login manager, you can reboot and end hopefully 
up in textconsole login. Now you can login as root, and on another console (try 
Alt + arrows) as user. Just do 'startx' or 'xinit' from the user console, and 
immediately see the result.

It just comes to my minid, if you don't know how to disable services, it might 
be easier to temporarily deinstall the loginmanager completely.


good luck


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