1. in /etc/apt/sources.list Repositories hin zu fügen (mit nano)
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# firmware
deb http://ftp.de.debian.org/debian buster-backports main non-free
deb http://deb.debian.org/debian/ stable main contrib non-free
deb-src http://deb.debian.org/debian/ stable main contrib non-free
deb http://deb.debian.org/debian/ stable-updates main contrib non-free
deb-src http://deb.debian.org/debian/ stable-updates main contrib non-free
deb http://deb.debian.org/debian-security stable/updates main
deb-src http://deb.debian.org/debian-security stable/updates main
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apt install firmware-amd-graphics
apt install firmware-atheros
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GRUB_CMDLINE_LINUX="noapic amd_iommu=off iommu=soft swiotlb=force,4096 hpet=disable"
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reboot