New versions of currently installed packages that cannot be upgraded without changing the install status of another package will be left at their current version. Packages currently installed with new versions available are retrieved and upgraded under no circumstances are currently installed packages removed, nor are packages that are not already installed retrieved and installed. Used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list(5). An update should always be performed before an upgrade or dist-upgrade.Īpt-get upgrade will fetch new versions of packages existing on the machine if APT knows about these new versions by way of apt-get update. The indexes of available packages are fetched from the location(s) specified in /etc/apt/sources.list(5). Used to re-synchronize the package index files from their sources.
It will do this for all repositories and PPAs. Instead, it updates the package lists for upgrades for packages that need upgrading, as well as new packages that have just come to the repositories.Īpt-get update downloads the package lists from the repositories and "updates" them to get information on the newest versions of packages and their dependencies. In a nutshell, apt-get update doesn't actually install new versions of software.
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