Public bug reported: Ubuntu 16.10
Steps to reproduce: 1. Install Ubuntu with a BTRFS root partition (/dev/sdb2 on my system). 2. After installation, convert to RAID 1 by adding another partition to the filesystem: $ btrfs device add /dev/sdb3 / $ btrfs filesystem balance / 3. Reboot. 4. Stuck at initramfs prompt. To get the system to boot I have to edit /boot/grub/grub.cfg and replace all instances of this: rootflags=subvol=@ with this: rootflags=subvol=@,device=/dev/sdb2,device=/dev/sdb3 The workaround can be applied permanently by editing /etc/grub.d/10_linux and replace this: rootflags=subvol=${rootsubvol} with this: rootflags=subvol=${rootsubvol},device=/dev/sdb2,device=/dev/sdb3 Then run update-grub ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1660882 Title: Can't boot from BTRFS RAID1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1660882/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs