相信不少小伙伴都尝试了icmp9的虚拟机，但是系统apt update会报错
直接喂给AI给出的解决方法，实测有效，依次运行即可

sudo cp /etc/apt/sources.list /etc/apt/sources.list.baksudo sed -i 's/http:\/\/security.debian.org\/ bullseye\/updates/ http:\/\/deb.debian.org\/debian-security\/ bullseye-security/g' /etc/apt/sources.listsudo sed -i '/bullseye-backports/d' /etc/apt/sources.listsudo apt update -y && sudo apt upgrade -y