https://openzfs.github.io/openzfs-docs/Getting%20Started/Ubuntu/Ubuntu%2018.04%20Root%20on%20ZFS.html#troubleshooting was just useful to me to fix grub on my zfs node...
Seriously, I've started making golang scripts instead of bash, and it feels a lot safer.
sure.. it's a bit more verbose, but you get a shitload of more features..
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