It's a PNG image, incorrectly named. When renamed to "tux", and then back to "tux.jpg" again, eog will open it without complaining. I'll search for the possible reasons of this behaviour in the upstream bug tracker and elsewhere. This probably qualifies as a duplicate of bug #172416.
It's a PNG image, incorrectly named. When renamed to "tux", and then back to "tux.jpg" again, eog will open it without complaining. I'll search for the possible reasons of this behaviour in the upstream bug tracker and elsewhere. This probably qualifies as a duplicate of bug #172416.