Normally, this is how I mount an ISO image file in Ubuntu
sudo mount -o loop -t iso9660 /path/to/iso/image/image.iso /where/to/mount/
I always forget this command since I don't have to deal with this type of file much so I have to google it every time I want to mount this one.
Fortunately, in my last attempt I found an easy way to mount an ISO file, Gmount-iso.
Just install it by apt-get as follow :
sudo apt-get install gmountiso
Browse for ISO image file, where you want to mount it and then click "Mount". That's all.
