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I'm on Mint, which is on an Ubuntu base, and I don't get that error message. Uploading doesn't work perfectly, not as well as when Microcosm first started, when it was extremely smooth, but with a few tries it's fine. It's still miles better than the total pain in the arse that uploading to vBulletin was. :)
Upload a single file, post it, edit it, add another file.
This seems to be the workaround.