Confirmed error message box is produced by openbox. Exact error message can be reproduced when the same command (captured by 'ps') was executed in a shell after killing the openbox process.
root@host# su - guest-tXsFUi
guest-tXsFUi@host:~$ killall openbox
guest-tXsFUi@host:~$ DISPLAY=:0 openbox --config-file /tmp/guest-tXsFUi/.config/openbox/lubuntu-rc.xml
Obt-Message: Xinerama extension is not present on the server
Obt-Message: Failed to open an Input Method
Openbox-Message: X server does not support locale.
Openbox-Message: Cannot set locale modifiers for the X server.
Openbox-Message: Requested key "XF86Terminal" does not exist on the display
Confirmed error message box is produced by openbox. Exact error message can be reproduced when the same command (captured by 'ps') was executed in a shell after killing the openbox process.
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root@host# ps auxw | grep openbox ei83jC/ .config/ openbox/ lubuntu- rc.xml
guest-e+ 32332 0.2 0.0 276904 10544 ? Sl 15:07 0:00 openbox --config-file /tmp/guest-
root 32463 0.0 0.0 11984 920 pts/2 S+ 15:07 0:00 grep --color=auto openbox
root@host# su - guest-tXsFUi host:~$ killall openbox
guest-tXsFUi@
guest-tXsFUi@ host:~$ DISPLAY=:0 openbox --config-file /tmp/guest- tXsFUi/ .config/ openbox/ lubuntu- rc.xml
Obt-Message: Xinerama extension is not present on the server
Obt-Message: Failed to open an Input Method
Openbox-Message: X server does not support locale.
Openbox-Message: Cannot set locale modifiers for the X server.
Openbox-Message: Requested key "XF86Terminal" does not exist on the display
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But still no idea how to fix