安装步骤：
1、安装桌面环境Gnome(ubuntu-desktop 可以更换 ubuntu-gnome-desktop)
apt install ubuntu-desktop gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal -y
2、安装VNCServer，安装完毕后执行一次vncserver设置初始密码
sudo apt-get install vnc4server sudo vncserver
3、执行一次vncserver之后，修改配置文件(红色为需要新加的内容)
vim ~/.vnc/xstartup
#!/bin/sh
# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic -nowin &
x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
x-window-manager &
gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &
# Fix to make GNOME work
export XKL_XMODMAP_DISABLE=1
/etc/X11/Xsession
4、重新启动vncserver即可登录