As I recall you can use the bulk rename function in Sigil itself. It will destroy the existing names, but it will fix the names where they are found in the epub, so the epub will work just fine.
Highlight the file names in the images folder and right click to select rename and it will give you a dialog box, so that you can choose the base name such as picture, image, etc followed by sequential numbers.
Linux is not fond of spaces in file names and Linux runs by Sony PRS-300 anyway.
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