So I tried to create a bootable USB dirve with Startup Disk Creator on Ubuntu 12.04 using an Ubuntu 14.04 iso.
The first USB drive I tried already had an old boot image on it and Startup Disk Creator gave me the "
Checksums do not match" error. So I tried another USB drive that had never had a boot image installed and it worked!
Now when I tried to load a different version onto the second USB drive I get the "
Checksums do not match" error again. So it seems that if a boot image is installed then Starup Disk Creator fails? How ca I get this to work?