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root:~# apt-get upgrade

Reading package lists... Done

Building dependency tree      

Reading state information... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

1 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Do you want to continue [Y/n]? y

Setting up mdadm (3.1.4-1+8efb9d1ubuntu6) ...

dpkg: error processing mdadm (--configure):

 subprocess installed post-installation script returned error exit status 20

No apport report written because MaxReports is reached already

                                                              Errors were encountered while processing:

 mdadm

E: Sub-process /usr/bin/dpkg returned an error code (1)

root:~# apt-get upgrade

Reading package lists... Done

Building dependency tree      

Reading state information... Done

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

1 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Do you want to continue [Y/n]? y

Setting up mdadm (3.1.4-1+8efb9d1ubuntu6) ...

dpkg: error processing mdadm (--configure):

 subprocess installed post-installation script returned error exit status 20

Errors were encountered while processing:

 mdadm

E: Sub-process /usr/bin/dpkg returned an error code (1)

root:~#