If this is a non-root pool which is not available at boot, then you should do
sudo zpool set cachefile=none POOL
That will inhibit the creation of a zpool.cache file for that pool.
The other option, if this is always plugged in, would be to configure it
to unlock automatically on boot. For example, using a key file. This
would be secure only if the root file system is also on LUKS.
** Changed in: zfs-linux (Ubuntu)
Status: New => Incomplete
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Ubuntu 16.04 breaks boot with wrong zpool.cache
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