Software Time! Video Editors

So you captured your videos and want to edit them? A popular video editor is OpenShot Video Editor
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https://apps.ubuntu.com/cat/applications/openshot/
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(This is taken from the above link)

OpenShot Video Editor is a free, open-source, non-linear video editor. It can create and edit videos and movies using many popular video, audio, and image formats. Create videos for YouTube, Flickr, Vimeo, Metacafe, iPod, Xbox, and many more common formats!

Features include:

• Multiple tracks (layers)
• Compositing, image overlays, and watermarks
• Support for image sequences (rotoscoping)
• Key-frame animation
• Video and audio effects (chroma-key)
• Transitions (lumas and masks)
• 3D animation (titles and physics simulations)
• Chroma key (green screen & blue screen)
• Transcode (convert video encodings)
• Upload videos (YouTube and Vimeo supported) 

You can find it in the Ubuntu Software Center or you can find it in the above link.

Be aware if it is sluggish you need a more powerful system.

ALSO NOTE: This is not the only video editor out there for Linux, If you can brave the WINE software, A video editor may be able to run and render videos without a problem.