sources.list

sudo apt update ; sudo apt upgrade -y

Edit /etc/apt/sources.list and add contrib and non-free to the end of each line.

sudo vim /etc/apt/sources.list
/etc/apt/sources.list
deb http://deb.debian.org/debian bullseye main contrib non-free
deb-src http://deb.debian.org/debian bullseye main contrib non-free

deb http://deb.debian.org/debian-security/ bullseye-security main contrib non-free
deb-src http://deb.debian.org/debian-security/ bullseye-security main contrib non-free

deb http://deb.debian.org/debian bullseye-updates main contrib non-free
deb-src http://deb.debian.org/debian bullseye-updates main contrib non-free

sudo apt update ; sudo apt upgrade -y
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