修改sources.list

deb http://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free
 
deb http://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free
 
deb http://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
 
deb http://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian-security/ bullseye-security main contrib non-free

修改时区

1）sudo dpkg-reconfigure tzdata
2）timedatectl set-timezone Asia/Shanghai
3）echo Asia/Shanghai > /etc/timezone && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

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