install X-Plane with virtual monitor

apt install ubuntu-drivers-common
ubuntu-drivers list
# virtualbox-guest-dkms
# virtualbox-guest-dkms-hwe
# nvidia-driver-390
# virtualbox-guest-x11
 apt install nvidia-driver-390




sudo add-apt-repository ppa:darabi/gfx
sudo apt-get update
sudo apt install unzip libglu1 xvfb x11vnc libopenal-dev
wget https://astuteinternet.dl.sourceforge.net/project/virtualgl/2.6.1/virtualgl_2.6.1_amd64.deb
dpkg -i virtualgl_2.6.1_amd64.deb
wget https://www.x-plane.com/update/installers11/X-Plane11InstallerLinux.zip
unzip X-Plane11InstallerLinux.zip
export DISPLAY=:1
Xvfb :1 -screen 0 1024x768x24 >> xsession.log 2>&1 &
x11vnc -localhost -display :1 >> x11vnc.log 2>&1 &
./X-Plane\ 11\ Installer\ Linux
./X-Plane\ 11/X-Plane-x86_64






VirtualBox GPU passthough:
/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet modprobe.blacklist=nouveau intel_iommu=on"

/etc/modules
vfio
vfio_iommu_type1
vfio_virqfd
vfio_pci
vhost-net

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 21)
01:00.0 VGA compatible controller: NVIDIA Corporation GK208 [GeForce GT 710B] (rev a1)

lspci -nn | grep 01:00.
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK208 [GeForce GT 710B] [10de:128b] (rev a1)
01:00.1 Audio device [0403]: NVIDIA Corporation GK208 HDMI/DP Audio Controller [10de:0e0f] (rev a1)

/etc/modprobe.d/local.conf
options vfio-pci ids=10de:128b,10de:0e0f




update-initramfs -u

VBoxManage modifyvm "Desktop" --pciattach 01:00.0@01:05.0