barkha@ubuntu:~$ sudo apt-get install kmail
[sudo] password for barkha:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  gnupg-agent gpgsm kdelibs-data kdelibs4c2a libcupsys2 libgnutls13 libjasper1
  libkadm55 libkcal2b libkdepim1a libkeyutils1 libkleopatra1 libkmime2
  libkpimidentities1 libkrb5-dev libkrb53 libksba8 libksieve0 libktnef1
  liblzo2-2 libmimelib1c2a libstdc++6 pinentry-qt
Suggested packages:
  fam clamav f-prot-installer gnutls-bin krb5-doc krb5-user pinentry-doc
Recommended packages:
  pinentry-curses pinentry kleopatra procmail
The following packages will be REMOVED:
  kontact
The following NEW packages will be installed:
  gnupg-agent gpgsm libjasper1 libkeyutils1 libksba8 liblzo2-2 pinentry-qt
The following packages will be upgraded:
  kdelibs-data kdelibs4c2a kmail libcupsys2 libgnutls13 libkadm55 libkcal2b
  libkdepim1a libkleopatra1 libkmime2 libkpimidentities1 libkrb5-dev libkrb53
  libksieve0 libktnef1 libmimelib1c2a libstdc++6
17 upgraded, 7 newly installed, 1 to remove and 370 not upgraded.
Need to get 24.6MB of archives.
After unpacking 942kB disk space will be freed.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  libktnef1 libkdepim1a libkcal2b libkleopatra1 libkmime2 libkpimidentities1
  libksieve0 libmimelib1c2a kmail
Install these packages without verification [y/N]? y
Get:1 http://in.archive.ubuntu.com gutsy/main libstdc++6 4.2.1-5ubuntu4 [315kB]
Err http://www.xinh.org ./ libktnef1 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libkdepim1a 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libkcal2b 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libkleopatra1 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libkmime2 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libkpimidentities1 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libksieve0 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ libmimelib1c2a 4:3.5.9
  404 Not Found
Err http://www.xinh.org ./ kmail 4:3.5.9
  404 Not Found
Get:2 http://in.archive.ubuntu.com gutsy/main liblzo2-2 2.02-3 [59.8kB]
Get:3 http://in.archive.ubuntu.com gutsy/main libgnutls13 1.6.3-1build1 [314kB]
Get:4 http://in.archive.ubuntu.com gutsy/main libkeyutils1 1.2-3 [4960B]
Get:5 http://in.archive.ubuntu.com gutsy-updates/main libkrb5-dev 1.6.dfsg.1-7ubuntu0.1 [88.6kB]
Get:6 http://in.archive.ubuntu.com gutsy-updates/main libkadm55 1.6.dfsg.1-7ubuntu0.1 [148kB]