Thanks. But I don't want to build kernels as part of normal operation once it's set up, I want the device to last its expected useful lifetime with just period

Thanks. But I don't want to build kernels as part of normal operation once it's set up, I want the device to last its expected useful lifetime with just periodic apt updates. This means a LTS distro that ships kernels for the device. Otherwise the setup is fail-open security wise, depending on my constant active tinkering. Maybe Odroid happen to be exceptionally good and the vendor provided Ubuntu fork is good enough for this, but I don't see an easy way to check their track record over a longer timespan and for devices that are several generations behind their latest and greatest.