ZDNet writes: Canonical, the company behind the Ubuntu operating system, has suffered a massive data breach on its forums. All usernames, passwords, and email addresses were stolen.
Ubuntu Forums suffered a massive data breach, the company behind the Linux open-source based operating system said on Saturday.

In an announcement posted on its main forum page, Canonical confirmed there had been a security breach and that the team is working to restore normal operations.

The forum itself is understood to be using vBulletin, a popular Web-based forum software and an estimated 1.82 million users are subscribed to the forums. The site was defaced by hackers during Saturday afternoon, according to social media reports.

Read on at ZDNet:

One piece of advice:
If you use the same password for other services, like e-mail: change your password(s) ASAP!