[ubuntu] About VirtualBox installation and VMs migration

Hi all,

Host - Ubuntu 12.04 desktop 64bit
Virtualizer - Oracle VirtualBox
AMD 8-core

Please advise where can I find howto/instruction re installing VirtualBox from the package download on;
Download VirtualBox for Linux Hosts
https://www.virtualbox.org/wiki/Linux_Downloads

NOT installed from the package, oracle_vbox.asc.

Most of the threads found with googling are installing on oracle_vbox.asc.

I have a box here running for several years and been upgraded many times;
Host - Ubuntu 12.04 desktop 64bit
Virtualizer - Oracle VirtualBox
AMD 4-core

I already forgot how to install VirtualBox. The Original host was Ubuntu 7.0/8.0

Besides where can I find instruction migrating the VMs from the old host to new host (on another PC)

TIA

B.R.
satimis