raspberry 4B 装 unbunt 20.04

1. 下载  对应镜像b并解压

2. win32diskimage 烧录到TF中.

3. TF卡放入 rapsberry 4b. 连u接HDMI显示器. 接入鼠标键盘网线.

4. 开机密码: ubuntu/ubuntu  需要立刻修改登录密码.

5. 设置网络

$ cat /etc/netplan/50-cloud-init.yaml

network:
    ethernets:
        eth0:
            dhcp4: true
            optional: true
    version: 2
    wifis:
            wlan0:
                    dhcp4: true
                    access-points:
                            "你的wifi的ssid":
                                    password: "你的密码"
然后执行
netplan try
netplan apply
ping 8.8.8.8 确认网络畅通.

  执行 
  sudo apt install openssh-server  ### 然后就可以使用 远程登录修改其他的配置了.

6. 修改源. 
  此页面是X86架构, ARM架构换成 把 ubuntu 改为 ubuntu-ports 即可.:

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb  focal main restricted universe multiverse
# deb-src  focal main restricted universe multiverse
deb  focal-updates main restricted universe multiverse
# deb-src  focal-updates main restricted universe multiverse
deb  focal-backports main restricted universe multiverse
# deb-src  focal-backports main restricted universe multiverse
deb  focal-security main restricted universe multiverse
# deb-src  focal-security main restricted universe multiverse


# 预发布软件源，不建议启用
# deb  focal-proposed main restricted universe multiverse
# deb-src  focal-proposed main restricted universe multiverse
						
							
						
然后执行 sudo apt update; sudo apt dist-upgrade

     
7. 安装桌面系统.

sudo apt install ubuntu-desktop
sudo apt install xrdp
sudo apt install language-pack-zh-hans language-pack-zh-hans-base language-pack-gnome-zh-hans language-pack-gnome-zh-hans-base
sudo apt install `check-language-support -l zh`
sudo reboot

8. 

允许root登陆

sudo passwd root //设置root密码

sudo vim /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf //编辑此文件

//添加下列两行到50-ubuntu.conf

greeter-show-manual-login=true

allow-guest=false