I am having several issues which includes the update and some other software installation issues

W: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/trusty/main/binary-amd64/Packages Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.
owais@owais-HP-1000-Notebook-PC:~$ find /etc/apt -name '*.list' -exec bash -c 'echo -e "\n$1\n"; cat -n "$1"' _ '{}' \;

/etc/apt/sources.list.d/libdvdcss.list

     1 # deb ftp://ftp.videolan.org/pub/debian/stable ./

/etc/apt/sources.list.d/ros-latest.list

     1 deb http://packages.ros.org/ros/ubuntu trusty main

/etc/apt/sources.list

     1 ## deb cdrom:[Ubuntu 14.04.5 LTS _Trusty Tahr_ - Release amd64 (20160803)]/ trusty main restricted
     2
     3 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
     4 # newer versions of the distribution.
     5 deb http://archive.ubuntu.com/ubuntu trusty main restricted
     6 deb-src http://archive.ubuntu.com/ubuntu trusty main restricted
     7
     8 ## Major bug fix updates produced after the final release of the
     9 ## distribution.
    10 deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted
    11 deb-src http://archive.ubuntu.com/ubuntu trusty-updates main restricted
    12
    13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
    14 ## team. Also, please note that software in universe WILL NOT receive any
    15 ## review or updates from the Ubuntu security team.
    16 deb http://archive.ubuntu.com/ubuntu trusty universe
    17 deb-src http://archive.ubuntu.com/ubuntu trusty universe
    18 deb http://archive.ubuntu.com/ubuntu trusty-updates universe
    19 deb-src http://archive.ubuntu.com/ubuntu trusty-updates universe
    20
    21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
    22 ## team, and may not be under a free licence. Please satisfy yourself as to
    23 ## your rights to use the software. Also, please note that software in
    24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
    25 ## security team.
    26 deb http://archive.ubuntu.com/ubuntu trusty multiverse
    27 deb-src http://archive.ubuntu.com/ubuntu trusty multiverse
    28 deb http://archive.ubuntu.com/ubuntu trusty-updates multiverse
    29 deb-src http://archive.ubuntu.com/ubuntu trusty-updates multiverse
    30
    31 ## N.B. software from this repository may not have been tested as
    32 ## extensively as that contained in the main release, although it includes
    33 ## newer versions of some applications which may provide useful features.
    34 ## Also, please note that software in backports WILL NOT receive any review
    35 ## or updates from the Ubuntu security team.
    36 deb http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
    37 deb-src http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse
    38
    39 deb http://archive.ubuntu.com/ubuntu trusty-security main restricted
    40 deb-src http://archive.ubuntu.com/ubuntu trusty-security main restricted
    41 deb http://archive.ubuntu.com/ubuntu trusty-security universe
    42 deb-src http://archive.ubuntu.com/ubuntu trusty-security universe
    43 deb http://archive.ubuntu.com/ubuntu trusty-security multiverse
    44 deb-src http://archive.ubuntu.com/ubuntu trusty-security multiverse
    45
    46 ## Uncomment the following two lines to add software from Canonical's
    47 ## 'partner' repository.
    48 ## This software is not part of Ubuntu, but is offered by Canonical and the
    49 ## respective vendors as a service to Ubuntu users.
    50 # deb http://archive.canonical.com/ubuntu trusty partner
    51 # deb-src http://archive.canonical.com/ubuntu trusty partner
    52
    53 ## This software is not part of Ubuntu, but is offered by third-party
    54 ## developers who want to ship their latest software.
    55 # deb http://extras.ubuntu.com/ubuntu trusty main
    56 # deb-src http://extras.ubuntu.com/ubuntu trusty main
owais@owais-HP-1000-Notebook-PC:~$ sudo dpkg --audit
The following packages are in a mess due to serious problems during
installation. They must be reinstalled for them (and any packages
that depend on them) to function properly:
 ttf-mscorefonts-installer (no description available)

The following packages are missing the list control file in the
database, they need to be reinstalled:
 ttf-mscorefonts-installer (no description available)

The following packages are missing the md5sums control file in the
database, they need to be reinstalled:
 ttf-mscorefonts-installer (no description available)