Lightworks is an open source non-linear video editing system which is probably the best available at the 'freemium' price range.
Before you begin installation, please make sure that your system has the following specs:
- Intel i7 chipset or faster, fast AMD chipset
3GB RAM or higher - Two high-resolution displays (1920 x1080) or above
- PCI Express graphics card (NVIDIA or ATI) with 1GB or higher
- Separate media and system drives (these can be internal or external as long as the interface is suitably fast
- Compatible sound card
- 200MB Disk space for Lightworks installation
To begin, open your terminal with:
Ctrl+Alt+T
Then run the following commands:
sudo apt-get install gdebi
$ wget ftp.us.debian.org/debian/pool/main/t/tiff3/libtiff4_3.9.6-11_amd64.deb
$ wget http://www.lwks.com/dmpub/lwks-12.0-amd64.deb
$ sudo gdebi libtiff4_3.9.6-11_amd64.deb
$ sudo gdebi lwks-12.0-amd64.deb
Once the installation is complete, you should be able to open and run the program.
Related: How To Install Kdenlive on Ubuntu