dephtu@dephtop:~$ sudo apt-get remove --purge mdadm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  mdadm*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
Need to get 0B of archives.
After unpacking 627kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 182473 files and directories currently installed.)
Removing mdadm ...
update-initramfs: deferring update (trigger activated)
Purging configuration files for mdadm ...
dpkg - warning: while removing mdadm, directory `/etc/mdadm' not empty so not removed.
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-2.6.22-14-server
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
dephtu@dephtop:~$ wajig install mdadm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  mdadm
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/220kB of archives.
After unpacking 627kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously deselected package mdadm.
(Reading database ... 182437 files and directories currently installed.)
Unpacking mdadm (from .../mdadm_2.6.2-1ubuntu2_i386.deb) ...
Setting up mdadm (2.6.2-1ubuntu2) ...
Generating mdadm.conf... done.
 Removing any system startup links for /etc/init.d/mdadm-raid ...
update-initramfs: deferring update (trigger activated)
 * Starting MD monitoring service mdadm --monitor                                                                  [ OK ] 

Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-2.6.22-14-server
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory
find: /lib/firmware/2.6.22-14-server: No such file or directory