Cut from 6(!) years to 2 years. I had no idea the support stretched as far back as 6 years. 2 still seems totally reasonable, especially given all the work put into backwards compatibility in the kernel already.
Sorry for my dumb question but what is the difference between the Linux kernel at kernel.org and say the Linux kernal at Ubuntu.org? It is just different maintainers?
For example I believe the LTS version of Ubuntu runs for 5 years and you can pay for Pro support and get 10 years on their ESM version, if I understand correctly you can keep the same kernel version though the duration.
On your final note, it’s not really the same kernel version throughout, and at times they have bumped up major upstream kernel versions mid-LTS, but even disregarding that, they are constantly applying security patches (think of it as minor version increments with bugfixes from the future).
So sure, you’re running kernel 5.15.0 on Ubuntu LTS 22.04, but maybe you started at 5.15.0-36 and after a few months of incremental upgrades you’ll be running 5.15.0-85.
