nano /etc/apt/sources.list.d/pve-install-repo.list
nano /etc/apt/sources.list.d/pve-enterprise.list

注释掉

nano /etc/apt/sources.list

更换为

# deb https://deb.debian.org/debian bullseye main
deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription
deb https://deb.debian.org/debian bullseye main non-free contrib
deb-src https://deb.debian.org/debian bullseye main non-free contrib
deb https://deb.debian.org/debian-security bullseye-security main
deb-src https://deb.debian.org/debian-security bullseye-security main
# bullseye-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
deb https://deb.debian.org/debian bullseye-updates main contrib non-free
deb-src https://deb.debian.org/debian bullseye-updates main contrib non-free
# bullseye-backports, previously on backports.debian.org
deb https://deb.debian.org/debian bullseye-backports main contrib non-free
deb-src https://deb.debian.org/debian bullseye-backports main contrib non-free