Comment 9 for bug 32325

Thanks for your report.

As mentioned in comment 7 there is already a way to install from an iso. Mount the iso and use the file:/ URI. (man sources.list)
@BlessedGeek, you can't directly access the iso and forgot the first step of the blog post you mentioned "The first step is to mount the iso. For detailed tutorial on mounting iso in Ubuntu can be found here."
Furthermore, root need to have read access to the mounted iso. So using "archive mounter" from a user account won't work since root has no read access to the user's .gvfs directory.

An improvement could be to propose an option in software-properties to mount the iso and avoid the manual mount.
I'm affecting this report to software-properties and setting to triage.

Thanks for your help.