It is the file 'sudo apt edit-sources' edits. It looks like "linux-libre-4.14" is really absent from the repository (and "linux-libre-4.13" is still there): https://linux-libre.fsfla.org/pub/linux-libre/freesh/pool/main/l/

Try this command, which will install the Linux-libre 4.14 but switch to the next LTS version once available:
$ sudo apt install linux-libre-lts

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