Seems that btrfs ignores compression attribute if compression was set using mount option. So, the solution is to set compression attributes per-directory:
1) remove 'compress=zstd' from your fstab root record 2) sudo btrfs property set /boot compression lzo # ensure this dir will remain readable by grub 3) sudo btrfs filesystem defragment -vrclzo /boot # ensure /boot gets recompressed 4) for $d in bin etc lib lib64 opt sbin snap srv usr var; do sudo btrfs property set /$d compression zstd; done Directory list is for Ubuntu 18, check and adjust for your own needs. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1751517 Title: ubuntu bionic grub can't boot zstd compressed filesystem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1751517/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
