While these deprecation warnings do not strictly prevent the usage of apt-key and add-apt-repository with Ubuntu 22.04, it is not advisable to ignore them.
Starting with Ubuntu 20.10, the use of apt-key yields a warning that the tool will be deprecated in the near future likewise, add-apt-repository will also soon be deprecated. Any key added in this manner can be used to authorize the addition of any other external repository, presenting an important security concern. These keys are not limited to authorizing the single repository they were intended for. However, keys added using apt-key and add-apt-repository are trusted globally by apt. It’s closely related to the add-apt-repository utility, which adds external repositories using keyservers to an APT installation’s list of trusted sources. Apt-key is a utility used to manage the keys that APT uses to authenticate packages.
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