Has any one seen this issue when upgrading 5.5 to 6.0 u1. Looks like upgrade almost completes but then stop at Failed to stop Service VPxd. it looks to be around import of the 5.5 config to 6. When this happened you have to restore you system.
I also tried an older version GA and got a different error Failed to stop service vimPBSM.
I have been working with support but we hit the wall on finding a fix waiting to hear back.