As a workaround try and remove configured NTP references before performing 8.6.2 upgrade attempt. If it still does not work then remove configured NTP references from call manager and then make one of your router as a NTP server and make sure CUCM has reachability to that NTP server.
If it still does not work then please provide the complete ccm installation logs.
While researching an issue I across this old thread and I'd like to point out what the issue was here in case anyone else runs across it. The screenshot above shows what the issue is. The NTP was "synced" at stratum 10, which is considered out of sync. Depending on CUCM version, stratum 1-5 or 1-9 are considered in sync. 10 is considered out of sync and was more than likely the issue here.
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