The world famous communication software skype can easily install in ubuntu 9.10 Karmic koala with simple steps. Skype can be used for Free calls, video calls and instant messaging over the internet. Plus great value calls to phones anywhere in the world. with a broadband internet connection you can make low cost calls to land phones and mobile phones.
First you have to add medibuntu repository.
you can choose one of the following methods for adding medibuntu repository
Open a terminal and type
$ sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list
$ sudo apt-get update
$ sudo apt-get --yes -q --allow-unauthenticated install medibuntu-keyring
$ sudo apt-get -q update
OR
# gksu gedit /etc/apt/sources.list
and add the line
deb http://packages.medibuntu.org/ karmic free non-free
OR
Open System -->Administration-->Synaptic Package Manager and then Settings --> Repositories -->Other Software --> ADD --> deb http://packages.medibuntu.org/ karmic free non-free
After Adding Medibuntu
$ sudo apt-get install skype
Now Your skype is ready for use
$ skype
If you have a any difficulty you can directly download the deb file and install
Download the deb file for skype from here
now double click on the deb file
or
open a terminal and type
$ sudo dpkg -i skype-debian_2.0.0.72-1_i386.deb