The symptoms vary from server to server but some examples are:
The following error are typical of the issue, if they occurred during the upgrade.
Unable to move the specified item to another folder: 983a4a38-abba-49d9-b785-1dd1a9863b85, folder: cede1e9a-1ff4-4a1c-acc7-0b3e3b6cc564
Security_spMoveSecurityEntity: Old parent sec_Entity should exist.
SQL Exception details: code=50000, line=33, procedure=Security_spMoveSecurityEntity
Error moving Item guid 490a327f-34ca-4618-81f7-3fe975bee520 to folder guid 983a4a38-abba-49d9-b785-1dd1a9863b85. Folder does not exist.
During the upgrade the security was not transferred correctly from the old server. However it did not fail in a way that caused the upgrade process to halt.
This has been resolved in Symantec Installation Manager version 8.0.93 and later.
Restore to a pre upgrade state, make sure that Symantec Installation Manager is at a version equal to or greater than 8.0.93 and run the upgrade again.