Comment 3 for bug 306389

I agree - you can't apply the patch if you don't have network access ;)

Just to clear up:

    - The fix mentioned above was created because the default gateway *was* being configured, but was not being saved to /etc/network/interfaces - which would result in the gateway configuration being lost after a system restart.

    - Any changes made to the live system are not copied over to the hard disk upon installation (although we are planning on adding support for this in future versions).

Could you manually configure networking so you could update to the latest version, and confirm/refute if it fixes the issue.