Fun and laughter installing the June CU 2011 for SharePoint Server.

After installing the CU, and then running an update as per the instructions at:

You may get this error just after step 2 of the Config Wizard:

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An exception of type Microsoft.SharePoint.Administration.SPUpdatedConcurrencyException was thrown. Additional exception information: An update conflict has occurred, and you must re-try this action. The object SPUpgradeSession Name=Upgrade -20110924-194525-15 was updated by DOMAIN\ACCOUNT, in the PSCONFIG (7240) process, on machine SERVER. View the tracing log for more information about the conflict.

Total number of configuration settings run: 3

Total number of successful configuration settings: 2

Total number of unsuccessful configuration settings: 1

Successfully stopped the configuration of SharePoint Products.

Configuration of SharePoint Products failed. Configuration must be performed before you use SharePoint Products. For further details, see the diagnostic log located at [LOCATION OF LOG] and the application event log.

To Resolve:

1. stsadm -o setproperty -pn command-line-upgrade-running -pv No
2. IISReset
3. Restart the Windows SharePoint Timer
4. psconfig –cmd upgrade –inplace b2b –wait –force