FlashGet is a leading download manager and has the highest amount of users on the internet. It uses MHT(Multi-server Hyper-threading Transportation) technique, supports various protocols and has excellent document management features. FlashGet is a freeware without any adware or spyware.
Install flashget download manager in ubuntu
First you need to download .deb package from here once you have .deb package install by double clicking on it or run the following command from your terminal
sudo dpkg -i flashget-1.0.2-0_en.noarch.deb
Now you can open flashget from Applications->Internet->FlashGet