This is for 64 bit VirtualBox version: 6.1.18, Debian GNU/Linux 10 (buster) (and non-systemd derivatives MX, Devuan, ...)

:To Install

<install_package_names> virtualbox virtualbox-ext-pack virtualbox-guest-additions-iso </install_package_names>

<postinstall> gpasswd -M $(getent group users | cut -d: -f4) vboxusers </postinstall>

:To Remove

<uninstall_package_names> virtualbox virtualbox-ext-pack virtualbox-guest-additions-iso </uninstall_package_names>