Just wanted to get this out there. My system runs Ubuntu 18.04 with root on an SSD. Swap, /var and /home are on a ZFS mirrored raid of spinning disks. I ran into an issue when installing crossover (wine) applications. Since ZFS doesn't report free space in the same way traditional file systems do I was unable to install anything. I was able to solve this problem by mounting a separate disk with generic ext4 under ~/.cxoffice.
The issue has been reported to Codeweavers. I am posting this information at their request.
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