Added to the release notes at
<https://wiki.ubuntu.com/JauntyJackalope/ReleaseNotes#Setting%20wireless%20regulatory%20domain%20via%20module%20option%20no%20longer%20supported>:
Ubuntu 9.04 enables the CRDA wireless regulatory framework for
controlling which wireless channels are usable and visible in a
particular location. If you previously had to use the module option
similar to that below in /etc/modprobe.d/options to allow access to
certain channels in your locality then you may find that wireless will
not function at all:
* options cfg80211 ieee80211_regdom=EU
You should remove this kernel module option on upgrade to Ubuntu 9.04
and use the iw reg command instead.
** Changed in: ubuntu-release-notes
Status: New => Fix Released
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Wifi driver will fail to load if regulatory domain set in module options
https://bugs.launchpad.net/bugs/343026
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