Q: iPad update issues

The best idea in this case is probably to do the update using iTunes on a Mac or PC rather than trying to do it over  the air. The download is bigger doing it with iTunes but the upgrade process is often more reliable.

9.3 is on hold given some issues - you are better advised to wait and not immediately upgrade

The "list" of pertinent articles as I know them to be as of now

- you can read about the problems in these articles, and possibly find workarounds, particularly in the last one

If you can't activate your iPhone, iPad, or iPod touch after installing a software update - Apple Support

Apple pausing iOS 9.3 updates for older devices, working on activation fix | iMore

Apple releases new build of iOS 9.3 for users of iPad 2 affected by bricking bug | 9to5Mac 

Apple Addresses GSM iPad 2 Activation Bug With Revised iOS 9.3, but Broader Issue Remains Unfixed - Mac Rumors

If you can’t activate your iPad 2 (GSM model) after you update to iOS 9.3 - Apple Support 

Troubleshooting iOS 9.3 Update Problems

From a post by: ChitlinsCC

COnsider yourself lucky.  IOS 9.3 will cripple your iPad.  Wait until they fix the issues and enjoy trouble-free maila and Safari.

Hi

New 9.3 update for bug fix is out now just downloading on iphone 5s no problem .

Cheers

Brian