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Software Updates
Support for Linux on the laptops is being continuously improved. To take advantage of these improvements, it is important to keep your system up-to-date.
apt-get maintains a local database of available software. When new titles are added or new versions are released, this database must be updated so apt-get is aware of the changes. This is accomplished using the update verb.
$ sudo apt-get update
This verb does not require any arguments.
With an updated database, apt-get is aware of any available upgrades. To install them, use the dist-upgrade verb.
$ sudo apt-get dist-upgrade
dist-upgrade not only upgrades installed packages, but also resolves any differences in dependencies.
When you install a package, any dependencies are installed along with it. When this package is uninstalled, the dependencies are left installed by default.
The autoremove verb uninstalls any software that is no longer required and was not explicitly installed.
$ sudo apt-get autoremove
For example, the linux kernel uses a meta-package to point to the current version. When a new kernel version is released, this meta-package is updated to point to the newer version. The older version was not explicitly installed and is no longer required, so autoremove would uninstall it. This saves considerable space.
Do not visit the Help Desk for any Linux-related issues. They will re-image your machine.