This is somewhat a continuation of My machine runs Ubuntu Desktop 15.04 and I want to separately run Ubuntu from an external encrypted hard drive
The objective is to create an isolated (and secure) Ubuntu system (100% separate from the main Ubuntu system, as well as no possible route through wifi or anything else)
The manufacturer does not seem to support removal of the main drive (user Fabby suggested temporary replacement with the external drive, for installation purposes) but said that an eSATA connected external hard drive would be treated as an internal drive. Also, I don't have a DVD/CD drive, but I am under the impression that I can use a USB to do the install.
To create the isolated system, can I first set the boot order to be: 1st the blank eSATA connected external hard drive, and, 2nd the USB port (with the installer on the stick) (and thats it, never going to the internal drive) and go through the installation with the idea that the computer will not know anything about its primary internal hard drive (??) and install on the eSATA connected external hard drive? And then when the install has completed, change the boot order to be: 1st the eSATA connected hard drive and 2nd the internal drive? This would be so when I want the isolated system, I restart with the eSATA drive hooked up and when I don't want the isolated system, I restart without the eSATA hooked up. Will the internal drive be left completely off when running from the eSATA (thus ensuring system isolation)? Again, the isolated system will have its own encryption and password .. I recall Kon Boot can determine the Ubuntu password (and thus decrypt the drive) - will my method avoid that vulnerability?