Mainly to myself, my repository of tips and tricks of running Virtualbox under Linux. Feel free to use at your own risk.
Connected USB devices not showing up in the usb filter
Check, and add your user to vboxusers group
sudo usermod -a -G vboxusers $USER
Running Guest OS with different date time than Host OS
This is really useful to run old software with time limitations without messing up with the Host OS date/time settings.
It’s easy to specify a time offset from the Host OS in microseconds.
First get the vm name
VBoxManage list vms
Secondly apply the desired offset (example -1 year clock).
VBoxManage modifyvm "name in vm list" --biossystemtimeoffset -31536000000
(1y = 365d * 24h * 60m * 60s * 1000m)