Install Virtual Box on Host Lubuntu / Ubuntu. Problems with USB Port and Installation of Guest Addition on Guest Account of Virtualbox
To install virtualbox on the Host Ubuntu, better not use the version from the repository, i.e. do NOT
sudo apt-get install virtualbox
but rather download and install it from the Oracle virtualbox website. Otherwise the USB port is not working, (see stackoverflow). I also encountered problems to install the Guest Addition, when installing virtualbox from the repository.