If you are still using UBUNTU 9.10 [Karmic Koala], in which update is not supported anymore, & It will refuse to Update / install any new app using apt-get, BUT you can still use it by adding following repositories in /etc/apt/sources.list
Remove all older lines and add the following lines in
/etc/apt/sources.list using nano or gedit whatever you like.
deb http://old-releases.ubuntu.com/ubuntu/ karmic main restricted deb-src http://old-releases.ubuntu.com/ubuntu/ karmic main restricted deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted deb http://old-releases.ubuntu.com/ubuntu/ karmic universe deb-src http://old-releases.ubuntu.com/ubuntu/ karmic universe deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe deb http://old-releases.ubuntu.com/ubuntu/ karmic multiverse deb-src http://old-releases.ubuntu.com/ubuntu/ karmic multiverse deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse deb http://security.ubuntu.com/ubuntu karmic-security main restricted deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted deb http://security.ubuntu.com/ubuntu karmic-security universe deb-src http://security.ubuntu.com/ubuntu karmic-security universe deb http://security.ubuntu.com/ubuntu karmic-security multiverse deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse
After changing the sources list, first update apt.
apt-get update
then try installing any package , for example.
atp-get install openssh-server
It should work fine.
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