Software Installation and Updates



It is necessary to log in as administrator to install or update software*. For system security reasons only administrators are allowed to make changes in the system-files and folders where the software is installed.
Linux / root / sudo → more security


There are thousands of programs available to install on Ubuntu. These programs are stored in software archives (repositories) and are made freely available for installation over the Internet. This makes it very easy to install new programs in Linux, and it is also very secure, because each program you install is built specially for Ubuntu and checked before it is installed.
To organise the software, Ubuntu repositories are categorised into four groups: Main, Restricted, Universe, and Multiverse. The rationale used to determine which software goes into which category is based on the level of support that software development teams provide for a program and the level of compliance the program has to the Free Software Philosophy.
Medibuntu is an additional repository of packages that cannot be included into the Ubuntu distribution for legal reasons (copyright, license, patent, etc). It can easyly be added to the standard-repositories. Once added, the software contained in this repository can be installed exactly in the same way as the software contained in the standard-repositories (for example with Synaptic).

Software Installation with Synaptic

  1. Mark for installation
  2. check dependencies (recommended & suggested packages)
  3. Apply
  4. Restart?

Software Installation with terminal/CLI

sudo aptitude install

Software Updates

Applications → System → Update Manager


Some software may be installed without being an administrator