Video editing with Ubuntu

AVI Demux video editor
Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. The user interface doesn't exactly make this the ideal tool for complex editing (for instance, there's no "timeline" to arrange your clips), it does provide a good range of filters, resizing options, etc, it allows frame-accurate navigation thru your video, and individual frames can be saved as *.jpg images.

Most importantly, however, Avidemux makes it easy to create time-lapse videos from individual photos. As long as your image files are named sequencially (e. g. image0001.jpg, image0002.jpg, image0003.jpg, …), you simply drop the first one into Avidemux, and the software uses all subsequent image files in that folder to generate the video file.

Installation
Via Synaptic Package manager

Openshot video editor
Openshot provides plenty of options and flexibility even for relatively complex video editing tasks, including speed changes (something I haven't found in too many other free video editing tools).

Installation
sudo add-apt-repository ppa:openshot.developers/ppa
sudo apt-get update
sudo apt-get install openshot openshot-doc