5 years from Debian
+ 5 years Extended LTS by Freexian

Each Debian release has some peculiarities in terms of support, open the associated page to discover them:

Debian 8 Jessie will be supported until 30th June 2025.
Debian 9 Stretch will be supported until 30th June 2027.
Debian 10 Buster will be supported until 30th June 2029.
Debian 11 Bullseye will be supported until 30th June 2031.
Debian 12 Bookworm will be supported until 30th June 2033.



https://www.freexian.com/lts/extended/

Ubuntu LTS 12 years update

Ubuntu Pro is free for personal use. It offers the full suite of Ubuntu Pro capabilities for you – and any business you own – on up to 5 physical machines with unlimited VMs and/or containers you can run on top.

The extraordinary range of security updates in Ubuntu Pro is funded by large-scale, commercial users. Their subscriptions to Ubuntu Pro enable us to offer this service free of charge to personal users who might have their own, or family, or small business needs which we are glad to support as part of our mission and social impact. There are discount programs for specific use-cases, such as research, education, and academia.

If you decide to opt-in to Ubuntu Pro with either a free personal subscription or an enterprise subscription, you will get more security updates than ever before. If you don’t opt-in then there is no loss, you can continue using Ubuntu LTS without the Pro subscription as you always did.