See here: https://bitcointalk.org/index.php?topic=583449.msg10157069#msg10157069
/quote I think the easiest way is to get the deterministic seed words using the 'seed' command inside simplewallet. And recreate it on linux like so: "simplewallet --restore-deterministic-wallet words".
If your wallet is old and doesn't support the deterministic seed, you should just create a new one on linux and move your money there.