raspberry pi 4 ubuntu安装

1. 官网下载ubuntu-20.04.2-preinstalled-server-arm64+raspi.img.xz

2. ubuntu默认登录账号密码都是ubuntu，登录会要求改新密码

3. 开启root登录，sudo passwd root，设置root密码，sudo root切到root

4. /etc/hostname是修改主机名

5. 配置无线网卡/etc/netplan/50-cloud-init.yaml

network:
    ethernets:
        eth0:
            addresses: [3.1.1.2/24]
            dhcp4: no
            optional: true
        eth1:
            dhcp4: true
            optional: true
    wifis:
        wlan0:
            dhcp4: true
            optional: true
            access-points:
                "bi2_keting":
                    password: "00001111"
    version: 2

6. 开启root ssh
   /etc/ssh/sshd_config
   PermitRootLogin yes

7. 安装openvpn
   apt install openvpn
   scp root@192.168.0.101:/root/client_xxx.ovpn /root/ (取openvpn 文件)
   /usr/sbin/openvpn --config /etc/openvpn/xxx.ovpn & 临时连接上openvpn

8.设置开机自动连接openvpn