I just installed Bionic Beaver this morning, fresh install on my HP laptop. I selected the option to not have all the extra stuff like Rythmbox installed. First thing I did was install synaptic, then nemo file manager, then cubic. Then I started downloading the Bionic Beaver Desktop ISO to use with Cubic. My connection is too slow, so I decided I'd try to customize the mini.iso provided on the Alternative Downloads page. (Only 64mb for Bionic!)
Now in Cubic, I open the program, choose a project directory, then it takes me to a screen where it wants me to select an original ISO. I click a button labeled "select," then navigate to my Downloads folder and click mini.iso. Now when I click the select button, or enter, or double click the ISO file, nothing happens. What am I doing wrong? I've restarted multiple times and can't select any ISO files in my selection menu. Should I uninstall my file manager and install a different one? I think it's using whatever comes stock and not nemo... I just can't figure out how to actually select the ISO. This seems like a ridiculous issue to be having and asking about... but I'm totally stuck.
Here's a screenshot. How do I proceed from here?