If this is a non-root pool which is not available at boot, then you should do this: 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624844 Title: Ubuntu 16.04 breaks boot with wrong zpool.cache To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1624844/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs