title: apt-get update or apt-get install not working
body: <p>sudo apt-get update and sudo apt-get install not working I am getting following errors please help</p>
  
  <pre><code>sudo apt-get install -f
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Correcting dependencies... Done
  The following extra packages will be installed:
    cheese cheese-common gnome-video-effects libcheese-gtk21 libcheese3
    libclutter-1.0-0 libclutter-1.0-common libclutter-gst-1.0-0
    libclutter-gtk-1.0-0 libclutter-imcontext-0.1-0 libcluttergesture-0.0.2-0
    libcogl-common libcogl-pango0 libcogl9 libmx-1.0-2
  Suggested packages:
    gnome-video-effects-frei0r
  The following NEW packages will be installed:
    cheese-common gnome-video-effects libcheese-gtk21 libcheese3
    libclutter-1.0-0 libclutter-1.0-common libclutter-gst-1.0-0
    libclutter-gtk-1.0-0 libclutter-imcontext-0.1-0 libcluttergesture-0.0.2-0
    libcogl-common libcogl-pango0 libcogl9 libmx-1.0-2
  The following packages will be upgraded:
    cheese
  1 upgraded, 14 newly installed, 0 to remove and 5 not upgraded.
  3 not fully installed or removed.
  Need to get 4,807 kB of archives.
  After this operation, 11.2 MB of additional disk space will be used.
  Do you want to continue [Y/n]? Y
  WARNING: The following packages cannot be authenticated!
    libcogl9 libcogl-pango0 libclutter-1.0-0 libclutter-gst-1.0-0 cheese
    cheese-common libcheese3 libclutter-gtk-1.0-0 libclutter-imcontext-0.1-0
    libcluttergesture-0.0.2-0 libmx-1.0-2 libcheese-gtk21 gnome-video-effects
    libclutter-1.0-common libcogl-common
  Install these packages without verification [y/N]? y
  Err http://in.archive.ubuntu.com/ubuntu/ precise/main libcogl9 i386 1.10.0-0ubuntu2
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/main libcogl-pango0 i386 1.10.0-0ubuntu2
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/main libclutter-1.0-0 i386 1.10.6-1~precise1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/main libclutter-gst-1.0-0 i386 1.5.4-0ubuntu2
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/universe cheese i386 3.4.1-0ubuntu2.1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/universe cheese-common all 3.4.1-0ubuntu2.1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/universe libcheese3 i386 3.4.1-0ubuntu2.1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/main libclutter-gtk-1.0-0 i386 1.2.0-0ubuntu1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/universe libclutter-imcontext-0.1-0 i386 0.1.4-2build1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/universe libcluttergesture-0.0.2-0 i386 0.0.2.1-2ubuntu3
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/universe libmx-1.0-2 i386 1.4.3-0ubuntu1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/universe libcheese-gtk21 i386 3.4.1-0ubuntu2.1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/universe gnome-video-effects all 0.4.0-1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise-updates/main libclutter-1.0-common all 1.10.6-1~precise1
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Err http://in.archive.ubuntu.com/ubuntu/ precise/main libcogl-common all 1.10.0-0ubuntu2
    Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/cogl/libcogl9_1.10.0-0ubuntu2_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/cogl/libcogl-pango0_1.10.0-0ubuntu2_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/clutter-1.0/libclutter-1.0-0_1.10.6-1~precise1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/clutter-gst/libclutter-gst-1.0-0_1.5.4-0ubuntu2_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/cheese/cheese_3.4.1-0ubuntu2.1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/cheese/cheese-common_3.4.1-0ubuntu2.1_all.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/cheese/libcheese3_3.4.1-0ubuntu2.1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/clutter-gtk/libclutter-gtk-1.0-0_1.2.0-0ubuntu1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/clutter-imcontext/libclutter-imcontext-0.1-0_0.1.4-2build1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/clutter-gesture/libcluttergesture-0.0.2-0_0.0.2.1-2ubuntu3_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/m/mx/libmx-1.0-2_1.4.3-0ubuntu1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/c/cheese/libcheese-gtk21_3.4.1-0ubuntu2.1_i386.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/g/gnome-video-effects/gnome-video-effects_0.4.0-1_all.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/clutter-1.0/libclutter-1.0-common_1.10.6-1~precise1_all.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/main/c/cogl/libcogl-common_1.10.0-0ubuntu2_all.deb  Something wicked happened resolving 'in.archive.ubuntu.com:http' (-5 - No address associated with hostname)
  E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
  </code></pre>
  
  <p>it seemed to be working fine before but i dont know what got installed that it started showing so many errors.</p>
  
  <p>The other solutions already provided for this issue dont work for me as I am behind an authenticated proxy server. my ip is 172.31.77.59, my dns servers are 172.31.100.8 and 172.31.100.9 and my proxy server is 172.31.100.29</p>
  
  <p>i searched some commands. the output of cat /etc/network/interfaces is</p>
  
  <pre><code>auto lo
  iface lo inet loopback 
  </code></pre>
  
  <p>maybe that helps in solving the problem</p>