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Ubuntu is composed of many software packages, the majority of which are free software. Free software gives users the freedom to study, adapt/modify, and distribute it. Ubuntu can also run proprietary software. Ubuntu Desktop is built around Unity, a graphical desktop environment.
Ubuntu comes installed with a wide range of software that includes LibreOffice, Firefox, Empathy, Transmission, and several lightweight games (such as Sudoku and chess). Additional software that is not installed by default (including software that used to be in the default installation such as Evolution, GIMP, Pidgin, and Synaptic) can be downloaded and installed using the Ubuntu Software Center or other APT-based package management tools. Programs in the Software Center are mostly free, but there are also priced products, including applications and magazines. Ubuntu can also run many programs designed for Microsoft Windows (such as Microsoft Office), through Wine or using a Virtual Machine (such as VirtualBox or VMware Workstation).
Ubuntu can close its own network ports using its own firewall software. End-users can install Gufw (GUI for Uncomplicated Firewall) and keep it enabled.
Ubuntu compiles its packages using GCC features such as PIE and buffer overflow protection to harden its software. These extra features greatly increase security at the performance expense of 1% in 32 bit and 0.01% in 64 bit.
Download Ubuntu 14.04 x86/x64Link
Ubuntu 14.04 x86/x64