After installing VirtualBox in Ubuntu, USB devices in virtual machines are not connected. The fact is that information about devices VirtualBox takes from the file system / proc / bus / usb, which is not mounted in Ubunt. To mount it, write the following in / etc / fstab: none /proc/bus/usb usbfs devgid=125,devmode=664 0 0 Save the file and execute sudo mount / proc / bus / usb in the console. Now you can connect devices to virtual machines.