This was added to the release notes, thanks:
== Kubuntu's Akonadi may need restarting ==
Akonadi startup is sometimes faulty preventing access to the address
book and other resources. To work around this, close and restart
Kontact. (Bug:564263)
** Changed in: ubuntu-release-notes
Status: New => Fix Released
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"No resource agents found" error when starting for the first time
https://bugs.launchpad.net/bugs/564263
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