xrdp configuration and xfce4

[Koichiro IWAO]

>> Again, in xrdp context, ~/.xinitrc or ~/.xsession doesn't affect. 
>> Forget
>> it and
>> see /usr/local/etc/xrdp/startwm.sh or ~/startwm.sh.
> 
> Partial success! xfce4 now starts automatically with a local startwm.sh
> file.

Which did you try? ~/startwm.sh? If you got success with ~/startwm.sh,
there might be a bug of xrdp. Some people reported similar issue to 
yours.

Let me break down the issue and help us improve xrdp before looking at 
clipboard issue.

1. remove ~/startwm.sh
2. confirm /usr/local/etc/xrdp/startwm.sh starts startxfce4
3. login via xrdp
4. you'll see xterm
5. see /var/log/xrdp-sesman.log
6. you'll see the log like this

[20180710-23:08:24] [CORE ] waiting for window manager (pid 41266) to 
exit
[20180710-23:08:24] [CORE ] error starting default wm for user meta - 
pid 41266
[20180710-23:08:25] [DEBUG] errno: 2, description: No such file or 
directory
[20180710-23:08:25] [DEBUG] execlp3 parameter list:
[20180710-23:08:25] [DEBUG]         argv[0] = startwm.sh
[20180710-23:08:25] [DEBUG]         argv[1] = startwm.sh

If you see the log like this, xrdp is failing to find 
/usr/local/etc/xrdp/startwm.sh.
If you specify the full path to startwm.sh in sesman.ini, it should 
work. Try it.
Don't forget to restart xrdp-sesman after you edited sesman.ini.

```
DefaultWindowManager=/usr/local/etc/xrdp/startwm.sh
```

Thank you for your cooperation.

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