Although you certainly can use traditional CPAN methods to install any sort of package you may want, most standard Perl packages are also available in the operating system's packaging system at some reasonably current level. The advantage here is that the entire (Perl) package level from which the (say, Debian) packages were derived will have been tested and consistent with one another. The only significant dis-advantage is that the Perl dependencies may or may not be matched in the operating system package-dependency tree: you might need to install other (Debian) packages to get things to work as intended because (Debian) didn't know that the dependency existed.
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