New answers tagged screencast
for me i prefer kdenlive is the best because it have an editor and plugin i try all you mention but all of them not comparable with it available by default on ubuntu 16.04 you can see more help here to install on ubuntu 14.04
Vokoscreen works remarkably well on my system. The screencast in this post was made with it. It has a number of options, a.o. to record a section of the screen, the whole screen, sound options and so on. You'll have to see if it works in your situation for your specific requirements though. Vokoscreen is in the repos.
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