Hi @eeickmeyer
thanks for raising that.
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Ubuntu Pro is a subscription on top of Ubuntu LTS. It provides some additional services such security patching commitment from Canonical for High and Critical CVEs in ‘main’ and ‘universe’ repositories for 10 years. You can read more about it in the Ubuntu Pro FAQ Ubuntu Pro - FAQ
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Ubuntu Pro is paid for enterprises and free for personal users on up to 5 machines, and up to 50 machines for Ubuntu community. It does not provide phone/ ticket support.
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Enterprise users (paid users) can opt-in to get support by subscribing to “Ubuntu Pro + Support” offers. Phone/ ticket support is not offered in the free/ personal tier.
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As you pointed out, Ubuntu Flavours are built from the repositories without additions or subscriptions, so all packages in Ubuntu Flavours could receive 10 years security maintenance with Ubuntu Pro.
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I feel that it should work fine, but as the Ubuntu Pro team, we have not tested any Pro related features with Ubuntu Flavours. Perhaps this is something you could test on your end? Also, please mind that our Support team doesn’t offer phone/ ticket support for Flavours. It is explicitly pointed out in the Ubuntu Pro Service Description https://ubuntu.com/legal/ubuntu-pro
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In conclusion - Canonical does not offer phone/ ticket support for Community Flavours. But when Ubuntu Pro subscription is attached, I believe that Flavours users would benefit from the Ubuntu Pro security maintenance for 10 years.
hope it helps!