这里以Debian12为例

修改国内源

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# 修改默认镜像源
sudo sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list

# 修改security镜像源
sudo sed -i 's|security.debian.org/debian-security|mirrors.ustc.edu.cn/debian-security|g' /etc/apt/sources.list

配置网络

vim /etc/network/interfaces

固定ip配置

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auto enp0s3
iface enp0s3 inet static
    address 192.168.1.240/24
    network 192.168.1.0
    broadcast 192.168.1.255
    gateway 192.168.1.1
    dns-nameservers 8.8.8.8
# 其中 network\broadcast 可以省略不写

DHCP配置

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iface enp0s3 inet dhcp

重启网络服务

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sudo systemctl restart networking.service