Dedicated software for Video Downloader for Ubuntu
Clipgrab
Clipgrab is yet another useful tool that helps you download videos from Youtube and other sites such as Vimeo and Daily Motion. With just a few clicks, you simply copy the Video Url and paste it in Clipgrab, as you define the resolution then finally hit Grab this Clip button.
To install Clipgrab, use the official PPA by the Clipgrab team.
# add-apt-repository ppa:clipgrab-team/ppa
Update the System
# apt update
Install Clipgrab
# apt install clipgrab
To launch Clipgrab run
# clipgrab