Skype has just been uploaded to the “partner” official Ubuntu 10.04 Lucid Lynx repository.
So you can now install skype in your ubuntu 10.04 without downloading the setup files from skype.
So to install Skype in Ubuntu 10.04 Lucid Lynx from the partner repository, go to System > Administration > Software Sources and on the “Other software” tab, enable (check the box next to it) the “http://archive.canonical.com/ubuntu lucid partner” repository.
Now type
$ sudo apt-get update
$ sudo apt-get install skype
Enjoy using skype.
See http://linux.dipin.info/2010/03/resolve-skype-video-chat-web-cam-issue.html to solve your webcam issues.