Você precisa de algo para emular um cliente Bonjour Sleep Proxy e há algo que faz isso: Sleep Proxy Client .
Eu realmente recomendo ler essa página, mas as instruções para instalá-la são bem simples:
sudo add-apt-repository 'deb http://repo.weinlein.info unstable main'
echo '-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)
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mPkuyVP2h+K+
=kSu4
-----END PGP PUBLIC KEY BLOCK-----' | sudo apt-key add -
sudo apt-get update
sudo apt-get install sleepproxyclient