Rooting again after installing LineageOS?
As you've already found out, LineageOS has its own, built-in, lightweight SU solution (addonsu), which is the only one supported officially (the team does not adore Magisk/SuperSU).

Note that officially LOS only provides 14.1 builds for your device. Assuming that's the version you're running, using the addonsu for 15.1 you will naturally bump into problems. As indicated in the source, your device is an arm one, so use addonsu-14.1-arm-signed.zip instead.

Magisk/SuperSU are reported by other users to work well enough, but you will need newer packages that work with higher Android versions, and the one you initially used (SuperSU 2.62) isn't enough.