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However, one of the wonders of Linux is still the possibility to obtain source code of a program to be studied, improved, and compiled.
If a certain package requires a certain resource such as a shared library, or another package, it is said to have a dependency.
While installing a package, you may be prompted to confirm the installation after the package manager has resolved all dependencies.
Note that running update or refresh (according to the package manager being used) is not strictly necessary, but keeping installed packages up to date is a good sysadmin practice for security and dependency reasons.
Suppose we need to verify if package mysql-common is installed on an Ubuntu system.It can either be provided by the distribution vendor through central repositories (which can contain several thousands of packages, each of which has been specifically built, tested, and maintained for the distribution) or be available in source code that can be downloaded and installed manually.Because different distribution families use different packaging systems (Debian: */ Cent OS: */ open SUSE: *built specially for open SUSE), a package intended for one distribution will not be compatible with another distribution.Note: Do not attempt to install on Cent OS a *file that was built for open SUSE, or vice-versa!Again, you will only upgrade an installed package manually when it is not available in the central repositories.