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Used to re-synchronize the package index files from their sources.
The indexes of available packages are fetched from the location(s) specified in /etc/apt/sources.list(5).
Like clean, autoclean clears out the local repository of retrieved package files.
The difference is that it only removes package files that can no longer be downloaded, and are largely useless.
An update should always be performed before an upgrade or dist-upgrade.
Used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list(5).
If the number of columns in the terminal is too small (e.g. This google image search should give you an idea of what the result looks like; it may not be to everybody's liking.
the window width is narrow), the line breaks will be wrong. Caveats: Fonts are generally limited to Times at hardcoded sizes. Some man pages were specifically designed for terminal viewing, and won't look right in PS or PDF form.
The configuration option APT:: Clean-Installed will prevent installed packages from being erased if it is set to off.These latter features may be used to override decisions made by apt-get's conflict resolution system.following the package name with an equals (=) and the version of the package to select. In spite of their scope, man pages are designed to be self-contained documents, consequentially limiting themselves to referring to other man pages when discussing related subjects.
This is in sharp contrast with the hyperlink-aware info files, GNU's attempt at replacing the traditional man page format.If a hyphen (-) is appended to the package name (with no intervening space), the identified package will be removed if it is currently installed.