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Bias frames are unnecessary. The bias is contained within the darks itself. Bias frames are only required when you're matching different exposure length darks with differing light frame lengths. I personally feel that this should be avoided unless using a good quality CCD camera where you can manipulate data with pixel math.
Flat frames should facilitate a histogram on your LCD preview which peaks 1/3rd to half-way across the histogram. They should be taken at the lowest ISO your camera can. If your flat lights are 1/100th of a second, then so should your flat darks be.
Try using some other software under a Windows virtual machine if you really must run Linux.
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