Don't be so impatient. If bug does not prevent Unity from starting it will linger for years. Anyway, here is workaround. The /bin/fsck.btrfs exists. If it is not there, reinstall btrfs-tools. Then,
sudo ln -s /bin/fsck.btrfs /sbin/fsck.btrfs
and all is fine.
Don't be so impatient. If bug does not prevent Unity from starting it will linger for years. Anyway, here is workaround. The /bin/fsck.btrfs exists. If it is not there, reinstall btrfs-tools. Then,
sudo ln -s /bin/fsck.btrfs /sbin/fsck.btrfs
and all is fine.