LOS 9
I also think maybe your iPad 2 storage is almost full. So it has not sufficient space for you to update. You should check it in the settings and ensure it has enough space. Also you can try to update your iPad to latest iOS version via iTunes, it is a good idea. If you want to know more about how to free up space, you can read this article:
How to free up Storage on iOS 9 1
Do you mean that your iPad cannot download iOS 9.0.1/iOS 9.0.2? Have you checked the storage space on your iPad, is is enough to download the package?
Or you can try update your iPad via iTunes not Over the Air. This post tells you the possible iOS 9 problems and might help.
The Most Common iOS 9 Update Problems and Solutions
It may be too full. Check how much free space you have. Try to have approximately 3GB free. Delete things that are easy to replace like apps, or music you can download again.
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