I have this problem with Kubuntu 18.10. I checked the permissions, and
the iso is owned by me and my group. Because I can't select the iso I
can't make a usable USB distribution stick. I am able to create USB
sticks on another computer running and earlier version of Linux Mint and
USB-creator.
Sorry it was my fault!
Did not have permission on the ISO file, I had downloaded it as another user,
had to chown to my user, not I am able to select the ISO and create the live
USB key.
** Changed in: usb-creator (Ubuntu)
Status: New => Invalid
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