Here is the content:
Ubuntu Forums is down for maintenance
There has been a security breach on the Ubuntu Forums. The Canonical IS team is working hard as we speak to restore normal operations. This page will be updated regularly with progress reports.
What we know
Unfortunately the attackers have gotten every user's local username, password, and email address from the Ubuntu Forums database.
The passwords are not stored in plain text, they are stored as salted hashes. However, if you were using the same password as your Ubuntu Forums one on another service (such as email), you are strongly encouraged to change the password on the other service ASAP.
Ubuntu One, Launchpad and other Ubuntu/Canonical services are NOT affected by the breach.
2013-07-20 2011UTC: Reports of defacement
2013-07-20 2015UTC: Site taken down, this splash page put in place while investigation continues.
If you're using Ubuntu and need technical support please see the following page for support:
If you're looking for a place to discuss Ubuntu, in the meantime we encourage you to check out these sites:
The Ubuntu subreddit
The Ubuntu Community on Google+
If you are registered in the forums and use the same password elsewhere change your password now. (In fact: Just do it anyway )
All users registered at Ubuntu have gotten their Userid and passwords "stolen".
It looks like the official Ubuntu forum has been truly FUBARED.