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I had a similar error (illegal instruction) when I first tried to run from sources on my Kubuntu computer. The problem turned out to be my CPU, which didn't support the SSE2 floating point instruction set. I got a 64-bit AMD chip and motherboard, built a 64-bit Kubuntu system on it, and *then* compiled something like Sigil 0.4.2. It worked OK then. I'm currently running Sigil 0.6.0 on Kubuntu 12.04 (64-bit), waiting for an official release of Qt5 to appear on the repositories before I upgrade Sigil to 0.7.x.
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