I have been trying to get my iPod touch to sync on Ubuntu 10.10. Every time I plug my iPod in my computer this error come up and says "Unhandeled Lockdown error-4" I use iOS 5 and I still can't get it to work. What can I do?
I don't know, but perhaps the software library libimobiledevice needs to get updated for the recently released iOS 5.
See the bug report on Launchpad: https://bugs.launchpad.net/ubuntu/+source/libimobiledevice/+bug/795475
There seems to be a patch for this: https://code.launchpad.net/~om26er/ubuntu/maverick/libimobiledevice/fix-iOS5-support