Preconfiguring packages ...
(Reading database ... 112475 files and directories currently installed.)
Preparing to replace mdadm 2.4.1-6ubuntu1 (using .../mdadm_2.4.1-6ubuntu2_i386.deb) ...
 * Stopping RAID array md3...                                                                                          [fail] 
 * Stopping RAID array md2...                                                                                          [fail] 
 * Stopping RAID array md1...                                                                                          [fail] 
invoke-rc.d: initscript mdadm-raid, action "stop" failed.
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
 * Stopping RAID array md3...                                                                                          [fail] 
 * Stopping RAID array md2...                                                                                          [fail] 
 * Stopping RAID array md1...                                                                                          [fail] 
invoke-rc.d: initscript mdadm-raid, action "stop" failed.
dpkg: error processing /var/cache/apt/archives/mdadm_2.4.1-6ubuntu2_i386.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
 * Assembling RAID array md0...                                                                                        [ ok ] 
 * Assembling RAID arrays...                                                                                           [ ok ] 
 * Starting RAID monitoring service mdadm --monitor                                                                           /sbin/mdadm already running.
                                                                                                                       [fail]
Errors were encountered while processing:
 /var/cache/apt/archives/mdadm_2.4.1-6ubuntu2_i386.deb