You have as first steps in installing on Ubuntu
1. go to System Menu > Software Sources > Third-Party Software;
2.click add and paste this line in:
ppa:sunab/kdenlive-release
on my 10.04 I have to do:
1. go to System Menu > Administration > Software Sources //Enter sudo password// > Other Software;
2.click
ppa:sunab/kdenlive-release
click
then after I relaoded Synaptic and entered "sudo apt-get update && sudo apt-get install kdenlive" in a terminal I got(at the end of a lot of Hit...s:
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
you forgot to tell me to close Synaptic after the reload!
But Where is the program? How do I start it?
The Quick start guide says "When you first start Kdenlive, you will have..." But HOW DO I START KDNLIVE?

A restart of Ubuntu gave me the program entry in the Applications > Sound & Video menu.
(Perhaps a restart of Nautilus would have done it too?)