I have two USB sticks, one with Ubuntu 12.04.1 and another with Ubuntu 12.04.2. I also have two CDROMS one with ubuntu 12.04.1 and another with 12.04.1. The former installs on virtualbox from USB stick or CDROM drive and the latter does not (this is on a Windows 7 64 bit guest).
However I can install to the laptop's hard drive with the USB stick with 12.04.2.
I can not install 12.04.2 on virtualbox on windows 7?