Epiphany

Epiphany
is the web browser for the GNOME desktop. Its goal is to be simple and easy to use. Epiphany ties together many GNOME components in order to let you focus on the Web content, instead of the browser application. As part of the GNOME project, Epiphany is Free Software.
Powered by the Gecko engine, Epiphany displays webpages with the same speed and accuracy as Mozilla Firefox. In addition, it provides an elegant, responsive and uncomplicated user interface that fits in perfectly with GNOME (…)

installing applications in Ubuntu

Ubuntu does not come with a preinstalled compiler such as gcc. If you ever want to gain that functionality you need to execute sudo apt-get install gcc in the terminal. After you do this, if you want to install an application from source usually you extract the file to a folder (tar xjf for .tar.bz2 and tar xzf for .tar.gz) and then run the following commands:
cd /path/to/folder
./configure
make
make install

(PaulStamatiou)

Ubuntu reposes

AddingRepositoriesHowto, LocalAptGetRepositories – Ubuntu Wiki (sometimes you need not only one package, but you have to provide a dependency like a library or whatever. When those dependencies are not in the official repositories, the only way to fulfill those dependencies is to put your package inside the repository.), AddingMultimediaRepositories – Ubuntu Wiki, How to Use Ubuntu Backports Correctly, BreakMyUbuntu (modeled onBreakMyGentoo) & PackageManagementHowto.
be careful, the repositories listed at apt-get.org are at the absolute bottom of the support ladder, and can include illegal or even malicious packages, and sometimes tend to fail even in their native Debian environment. [x]