Azure Virtual Machines—Ubuntu Advantage support service generally available

If you use Ubuntu Linux with your Azure subscription, you can now opt in to receive enterprise-grade support for your Ubuntu VMs through Ubuntu Advantage, the support package from Canonical. Complete a one-time prepay for standard and advanced tiers that will cover the first 30 days of support from Ubuntu. The first month of coverage is billed as a one-time charge, and subsequent months are billed per hour.

REF:  https://azure.microsoft.com/en-us/services/virtual-machines/linux-and-open/