Comment 21 for bug 1460447

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Dan Kegel (dank) wrote :

https://askubuntu.com/questions/836105/ubuntu-16-04-takes-long-time-to-boot-using-btrfs-and-persistent-logs suggests disabling COW on the systemd journal directory may help.

Avoiding / as btrfs, and using it just for e.g. /var/lib/lxd, may be an option for some people.