wsl2 安装后用 wifi 共享是能联网，问题出在公司网络限制 wsl2 IP 访问网络，但是主机可以上网。

解决办法，在主机用 nginx 设置代理，可能需要开端口权限

server {
    listen       9000;
    server_name  localhost;
    
    location /ubuntu/ {
        # 阿里源镜像地址
        proxy_pass https://mirrors.aliyun.com/ubuntu/; # 前端地址和端口
    }
    
}

/etc/apt/sources.list

# 阿里源镜像地址
deb http://192.168.5.116:9000/ubuntu/ focal main restricted universe multiverse
deb http://192.168.5.116:9000/ubuntu/ focal-security main restricted universe multiverse
deb http://192.168.5.116:9000/ubuntu/ focal-updates main restricted universe multiverse
deb http://192.168.5.116:9000/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://192.168.5.116:9000/ubuntu/ focal main restricted universe multiverse
deb-src http://192.168.5.116:9000/ubuntu/ focal-security main restricted universe multiverse
deb-src http://192.168.5.116:9000/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://192.168.5.116:9000/ubuntu/ focal-backports main restricted universe multiverse

sudo apt update

酸爽