sudo apt-get upgrade fails due to shared-mime-info.postinst error

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http://askubuntu.com – On my server I am getting following issue. sudo apt-get update work successfully but sudo apt-get upgrade fails with following error. Please help me to solve this issue. administrator@myserver:~$ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: firefox linux-headers-server linux-image-server linux-server 0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded. 21 not fully installed or removed. After this operation, 0B of additional disk space will be used. Do you want to co (HowTos)