> So if that table is correct, how to I downgrade to 4.14, and how do I > make sure I only get updates to that version, rather than newer kernel > versions?
If you are using jxself's repo, run $ sudo apt install linux-libre-4.14 which is a metapackage that always depends on the latest 4.14 kernel, so you'll get security updates to 4.14 but won't get upgraded to a newer kernel for as long as 4.14 is supported. When booting, select "Advanced Options for Trisquel" in the grub menu (if the grub menu is hidden, you might have to hold Shift) and select the 4.14 kernel. Once you've booted into 4.14, remove all kernels newer than 4.14, so that next time you boot 4.14 is the default.
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