x11vncd + vbox-standalone

Что бы запустить x11vncd для управления vbox-standalone нужно скопировать x11vncd.service в /etc/systemd/system и изменить User на vbox. 

В противном случае мы увидим ошибку: 

Hello,
Since the latest xorg update. x11vnc doesn't work on GDM. I get the following error message:
Dec 11 16:09:03 PC x11vnc[1032]: caught X11 error:
Dec 11 16:09:03 PC x11vnc[1032]: 11/12/2020 16:09:03 deleted 60 tile_row polling images.
Dec 11 16:09:03 PC x11vnc[1032]: X Error of failed request:  BadAccess (attempt to access private resource denied)
Dec 11 16:09:03 PC x11vnc[1032]:   Major opcode of failed request:  130 (MIT-SHM)
Dec 11 16:09:03 PC x11vnc[1032]:   Minor opcode of failed request:  1 (X_ShmAttach)
Dec 11 16:09:03 PC x11vnc[1032]:   Serial number of failed request:  57
Dec 11 16:09:03 PC x11vnc[1032]:   Current serial number in output stream:  119