Unable to specify acceptable path when creating bootable iso

I'm using the 3.1.0.468 version of the Dell Repository Manager on an Ubuntu machine, and have trouble creating an ISO file.

I tick the check box for the repository I want to update and click EXPORT. Regardless of what I enter as a location for the Smart Bootable ISO, I am served this error message when clicking EXPORT:

'The specified path is not accessible. Kindly check the path or access rights.'

I have tried several different directories that I know I have read/write access to, and even tried with root with the same result.

Anyone actually tried this with Linux?