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Update xfce4.md

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@ -385,3 +385,16 @@ xfconf-query -c xfce4-session -p /sessions/Failsafe/Client3_Command
11. 如果我们运行 xsession 提示 Can't open display， 即使我们设置环境变量 export DISPLAY=:10 ，也是这个提示，引起这个问题的原因有很多，但我们首先第一步要做的是要检查 xserver 服务在不在，一般情况通常会忽略这个检查
12. Xorg（xserver） 启动时，提示错误
```shell
Using system config directory "/usr/local/share/X11/xorg.conf.d"
MESA-LOADER: failed to open vmwgfx (search paths /usr/lib/x86_64-linux-gnu/dri)
failed to load driver: vmwgfx
MESA-LOADER: failed to open kms_swrast (search paths /usr/lib/x86_64-linux-gnu/dri)
failed to load driver: kms_swrast
MESA-LOADER: failed to open swrast (search paths /usr/lib/x86_64-linux-gnu/dri)
failed to load swrast driver
couldn't get display device
```
解决：缺失显卡驱动
apt install libgl1-mesa-dri