sudo -i
mv /etc/apt/sources.list /etc/apt/sources.list.bak
echo "deb https://mirrors.ustc.edu.cn/ubuntu/ noble main restricted universe multiverse" >> /etc/apt/sources.list echo "deb https://mirrors.ustc.edu.cn/ubuntu/ noble-security main restricted universe multiverse" >> /etc/apt/sources.list echo "deb https://mirrors.ustc.edu.cn/ubuntu/ noble-updates main restricted universe multiverse" >> /etc/apt/sources.list echo "deb https://mirrors.ustc.edu.cn/ubuntu/ noble-backports main restricted universe multiverse" >> /etc/apt/sources.list
apt update
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