• Does Ubuntu come with Flash Player preinstalled by default?
  Nope, modern versions of Ubuntu don’t ship with Flash Player preinstalled. Adobe discontinued full support for Flash Player back in 2020, so mainstream Linux distributions (including Ubuntu) removed it from their default setups a long time ago. It’s no longer considered a standard or recommended piece of preloaded software.

• Do I need to download Flash Player for Ubuntu, or is it already there?
  As noted, it’s not preinstalled by default. But your experience of installing it via terminal without seeing a download makes total sense—this probably means the package was already cached on your system. Ubuntu’s package manager (apt) keeps a local cache of packages you’ve downloaded before (or leftover from initial setup processes). If the Flash Player package was in that cache, the install command would just use the local copy instead of downloading it again.

  A quick heads-up though: since Flash is end-of-life, using it could pose security risks. Only use it if you absolutely have to access legacy content, and be mindful of potential vulnerabilities.

内容的提问来源于stack exchange，提问作者User17114027