(As of VirtualBox 3.2, the signing key was changed.
VIRTUALBOX LINUX IMAGE UBUNTU ARCHIVE
Oracle Corporation (VirtualBox archive signing key) The key fingerprint for oracle_vbox_2016.asc isī9F8 D658 297A F3EF C18D 5CDF A2F6 83C5 2980 AECF
Users of Oracle Linux 6, 7 and 8 can use the Oracle Linux yum repository and enable the ol6_developer channel for Oracle Linux 6, the ol7_developer channel for Oracle Linux 7, or the ol8_developer channel for Oracle Linux 8. The SHA256 checksums should be favored as the MD5 algorithm must be treated as insecure! You might want to compare the checksums to verify the integrity of downloaded packages.
Oracle Linux 8 / Red Hat Enterprise Linux 8 / CentOS 8.Please choose the appropriate package for your Linux distribution. The VirtualBox base package binaries are released under the terms of the GPL version 2.
VIRTUALBOX LINUX IMAGE UBUNTU INSTALL
To install VirtualBox anyway you need to setup a 64-bit chroot environment. Debian/Lenny ships an AMD64 kernel with 32-bit packages) are not supported.
Note: The package architecture has to match the Linux kernel architecture, that is, if you are running a 64-bit kernel, install the appropriate AMD64 package (it does not matter if you have an Intel or an AMD CPU).