Steadyflow is a simple and easy to use download manager, however it’s a bit more than just a downloader, it can also perform things on completion such as run another command or open the download file. It’s my first choice for downloading large files such as ISOs! All you need to do is just add the URL and it will take care of the rest and it can also do parallel downloads.
Installation with Ubuntu is just an apt-get away with:
sudo apt-get install steadyflow