確認 存儲庫及刪除package 的保留狀態
apt-mark showhold
apt-mark unhold [package_name]
apt update && sudo apt upgrade
apt install gcc-8-base
編輯 /etc/apt/sources.list 移除舊儲存庫並加入
deb http://deb.debian.org/debian bullseye main contrib non-free
deb http://deb.debian.org/debian bullseye-updates main contrib non-free
deb http://security.debian.org/debian-security bullseye-security main
deb http://ftp.debian.org/debian bullseye-backports main contrib non-free
apt update
apt full-upgrade -y
確認更新版本
cat /etc/debian_version
重新開機
systemctl reboot
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