I've followed the directions on http://www.ubuntu.com/download/deskt...tick-on-ubuntu
down to selecting the ISO image and the USB stick. When I select "Other," and highlight the downloaded ubuntu-13.04-desktop-i386.iso, and click "Open," I'm returned to the Startup Disk Creator with no change showing there. What keeps showing in the source disk image field is "/dev/sr0", OS version "MM10_D3", size "5.2GB".
"Make Startup Disk" is grayed out.
Update: An hour or two later, when I awakened the computer from Suspend, I looked again at the Startup Disk Creator, to find it showing the downloaded file, in the location where I'd asked it to look for it. Initially I had stored it in a folder called "Temporary," but I had subsequently moved it to my home folder, wondering whether that might somehow might make it easier for SDC to accept it.
Since SDC was finally looking for the image where it no longer was, I tried again to change the source image field to reflect that the downloaded file was then in my home directory, but again SDC wouldn't budge. I copied and pasted the source file back into the folder called "Temporary," so that SDC might find it there, since that was newly the only place it was willing to look.
The "Make Startup Disk" button shifts between grayed out with a white field, whenever I return from trying to select the source image, and grayed out with an orange field after I click on either the source field image or the device image. Neither is responsive to clicking.
Upshot: SDC is not responding.
My impasse is past. Turns out the MM10_D3 was the video that was in my DVD drive at the time, though I still don't know why SDC wouldn't listen to me. When I emptied the DVD drive, SDC behaved better.
There seems to have been something twitchy with my USB stick. I tried erasing it and formatting it, but was told I didn't have permission. I took it out and put it in my Windows machine and formatted it there, and then plugged it back into my Linux machine, and suddenly "Make Startup Disk" was functional. I think I got the image onto the stick. I'll try installing tomorrow morning.