A group of hacktivists have claimed responsibility for a distributed denial-of-service attack, which has affected several Ubuntu and Canonical websites, and prevented users from updating the Linux-based operating system.

Web hosts are scrambling to fix the bug under active attack by hackers. One company said hackers have been abusing the bug for months.

A group of hacktivists have claimed responsibility for a distributed denial-of-service attack, which has affected several Ubuntu and Canonical websites, and prevented users from…