Quote:
Is there any way to get file transfer via USB happening on Linux?


No. the Karma is a USB mass-storage device, but uses a filesystem that's not understood by Linux (or Windows, in fact -- RMM has built-in support).

Also, IIRC, there's some juju that has to happen over the USB channel to get it into mass storage mode, which would preclude simply creating separate partitions on the disk.

As far as I'm aware -- unlike the newer flash players that are USB mass storage devices, and use FAT32 -- there are no firmware upgrades that do anything about this.
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-- roger