Every time I try. To upgrade to 5.1 on my ipad2 ,I have tried at least 5 times a day, at different times, every day since it came out. It "looks" for new updates for 2 min's, then gives me the MSG, " can not look for updates there is an error.". And once I get mine done I need to upgrade. My husbands that was never. Upgraded to 5.0.