I've had this problem also. It seems to relate to a broken MD definition line created by mkconf
sudo /usr/share/mdadm/mkconf force-generate /etc/mdadm/mdadm.conf creates a line that looks like this: ARRAY /dev/md/array24 level=raid1 metadata=1.2 num-devices=2 UUID=a5ce2c19:4ab6c886:d226463a:f01fec16 name=:array24 while sudo mdadm --detail --scan generates: ARRAY /dev/md0 level=raid1 num-devices=2 metadata=01.02 name=:array24 UUID=a5ce2c19:4ab6c886:d226463a:f01fec16 I I replace the line in /etc/mdadm/mdadm.conf with the above and then run sudo update-initramfs -k all -u the problem is resolved. -- if array is given a name, a strange inactive md device appears instead of the one created upon reboot https://bugs.launchpad.net/bugs/576147 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs