Not sure as I won't put gemini on my box (clone killer) but is'nt gemini a maxvar image ?
Not sure if this method works with maxvar images ? you could try specifying the blocksize with -b <blocksize> , I think the default is 65535
./mksquashfs -help
will give more info
Another thing to check is that you have the correct version of mksquashfs.
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