nano /etc/apt/sources.list
deb http://deb.debian.org/debian/ trixie main contrib non-free
deb-src http://deb.debian.org/debian/ trixie main contrib non-free
deb http://deb.debian.org/debian trixie-updates main contrib non-free
deb-src http://deb.debian.org/debian trixie-updates main contrib non-free
deb http://security.debian.org/debian-security trixie-security main contrib non-free
deb-src http://security.debian.org/debian-security trixie-security main contrib non-free