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Debian installation seemingly worked but booting results in blackscreen

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I bought a second SSD to install Debain as a second OS on my Desktop (Win10 as primary OS). After installing Debian from a USB stick, when i start my PC i get a screen where I can choose what to boot (Debain / Windows / some memory tests). Windows still works fine, but when i choose Debian i see a few lines of text / code for a split second then the screen goes all black and nothing more happens. 
The trial mode, where you can start Debian without installing it worked just fine, but when i tried installing Ubuntu before i had similar problems (when choosing the Ubuntu USB stick as boot medium i got a ubuntu loading screen then blackscreen without even getting to install it).
After a few tries i managed to take a picture of the text:
“Loading, please wait…
[ 0.563840][drm:radeonpciprobe] ERROR radeon ernel modesetting for R600 or later requires firmware-linux-nonfree”
So apparently it is a problem with my GPU (VTX3D AMD HD 7870 Black Edition)
According to firmware-linux-nonfree is a package that includes firmware for various stuff including GPUs. How can i get this package if i can’t boot Debian?
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4 answers



Try editing the Boot to add nomodeset


The newest kernels have moved the video mode setting into the kernel. So all the programming of the hardware specific clock rates and registers on the video card happen in the kernel rather than in the X driver when the X server starts.. This makes it possible to have high resolution nice looking splash (boot) screens and flicker free transitions from boot splash to login screen. Unfortunately, on some cards this doesnt work properly and you end up with a black screen. Adding the nomodeset parameter instructs the kernel to not load video drivers and use BIOS modes instead until X is loaded. ” –

That should let you in. Then install the firmware for your video card.
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