Canonical says its web infrastructure is under attack after a pro-Iran hacktivist group instructed its members to target the open source giant. "I can confirm that Canonical's web infrastructure is under a sustained, cross-border Distributed Denial of Service (DDoS) attack" a Canonical spokesperson told The Register .  "Our teams are working to restore full availability to all affected services. We will provide updates in our official channels as soon as we are able to." Known best for managing the development of Ubuntu, the distro's main website is down at the time of writing, and has been for several hours. The hacktivist group The Islamic Cyber ​​Resistance in Iraq , aka 313 Team claimed responsibility for the 503 errors Ubuntu's website was returning on Thursday evening, announcing via its Telegram channel that the attack was scheduled to persist for four hours.…