I have a TechNet subscription and am supposed to get "priority support" but I mistakenly asked my question in one of the forums that is not in the "priority support monitored" list. Included here by reference:
Short description: On the 2012 DataCenter machine which serves as my Hyper-V host, I mount the install media and launch Setup. It starts, copies the temporary files ($windows.~bt) and then just quits.
Content of c:\windows\setupact.log:
2013-10-11 10:29:04, Info UI Determining whether we should run ConX or legacy setup
2013-10-11 10:29:04, Info UI Downlevel OS is server. Continue to run legacy setup
2013-10-11 10:29:04, Info UI Determining if we are in WDS/Unattend mode
2013-10-11 10:29:04, Info UI No need to hide autorun
2013-10-11 10:29:04, Info [0x0a000a] UI Autorun:Autorun core successfully initialized!!!
2013-10-11 10:29:04, Info [0x0a000b] UI Autorun:Autorun UI successfully initialized!!!
2013-10-11 10:29:04, Info UI AppWindow has layout style 0
2013-10-11 10:29:04, Info UI NavWindow has layout style 0
2013-10-11 10:29:04, Warning [0x0a0180] UI Failed to change the UI language to en-US.
2013-10-11 10:29:04, Info [0x0a011c] UI WizardDialogPost::SetActive
2013-10-11 10:29:09, Info [0x0a018e] UI Passing command line parameter ("H:\Sources\setup.exe /HideWelcome /uilanguage:en-US /targetlanguage:en-US") to IBS.
Would appreciate any suggestions that don't involve doing a detailed documentation capture of how the server is configured followed by a clean install, that is what I'm trying to avoid if possible.
I am not trying to do anything special or scripted, just a standard OS upgrade.