在ubuntu 24.04上安装x11vnc的方法（经过验证04/25/2024）
sudo apt update
sudo apt install x11vnc
x11vnc -storepasswd
下面的命令确认authentication文件的位置（示例中的uid 1000）
systemctl status display-manager.service
Apr 25 22:54:30 hwnga-VMware20-1 gdm-password][4052]: pam_unix(gdm-password:session): session opened for user hwnga(uid=1000) by hwnga(uid=0)
下面的命令输出x11，证明从wayland成功切换到了xorg:
hwnga@hwnga-VMware20-1:~$ echo $XDG_SESSION_TYPE
x11
试着在用户hwnga下运行以下命令：
/usr/bin/x11vnc -auth /var/run/gdm3/auth-for-hwnga-*/database -forever -loop -noxdamage -repeat -rfbauth /home/hwnga/.vnc/passwd -rfbport 5900 -shared
如果没有错误，则可以在另外机器上运行vncviewer，确认可以连接成功。
再创建x11vnc systemd service，如下：
[Unit]
Description=Start x11vnc at startup.
After=gdm.service
[Service]
Type=simple
User=hwnga
Group=hwnga
ExecStart=/usr/bin/x11vnc -auth /var/run/gdm3/auth-for-hwnga-*/database -forever -loop -noxdamage -repeat -rfbauth /home/hwnga/.vnc/passwd -rfbport 5900 -shared
运行下面的命令，启动x11vnc service
hwnga@hwnga-VMware20-1:~$ sudo systemctl daemon-reload
hwnga@hwnga-VMware20-1:~$ sudo systemctl enable x11vnc-hwnga.service
hwnga@hwnga-VMware20-1:~$ sudo systemctl start x11vnc-hwnga.service
hwnga@hwnga-VMware20-1:~$ sudo systemctl status x11vnc-hwnga.service
● x11vnc-hwnga.service - Start x11vnc at startup.
Loaded: loaded (/etc/systemd/system/x11vnc-hwnga.service; disabled; preset>
Active: active (running) since Thu 2024-04-25 23:20:19 CDT; 6s ago
Main PID: 9502 (x11vnc)
Tasks: 2 (limit: 29004)
Memory: 30.1M (peak: 55.4M)
CPU: 70ms
CGroup: /system.slice/x11vnc-hwnga.service
├─9502 /usr/bin/x11vnc -auth "/var/run/gdm3/auth-for-hwnga-*/datab>
└─9503 /usr/bin/x11vnc -auth "/var/run/gdm3/auth-for-hwnga-*/datab>
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: 25/04/2024 23:20:23
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: The VNC desktop is: hwnga-V>
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: PORT=5900
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: >
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: Have you tried the x11vnc '-ncac>
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: The scheme stores pixel data off>
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: retrieval. It should work with >
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: x11vnc -ncache 10 ...
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: One can also add -ncache_cr for >
Apr 25 23:20:23 hwnga-VMware20-1 x11vnc[9503]: More info: http://www.karlrunge.>
hwnga@hwnga-VMware20-1:~$
下面是安全访问 (如何你不在外网访问，不需要此步骤）：
先在ubuntu上安装openssh-server
sudo apt install openssh-server
sudo ufw allow ssh
sudo ufw allow 5900
sudo ufw enable
在window 上，安装mobaxterm, 开启tunelling。ssh server 是你的ubuntu的地址，端口22，用户名是ubuntu用户名。forward端口是你本地的一个未用的地址，比如6660。
在vnc reviewer上，使用localhost:6660来连接
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