Subuser DOES leverage existing package mangagers. All subuser &quot;packages&quot; are are scripts that call existing package managers: <a href="https:&#x2F;&#x2F;github.com&#x2F;subuser-security&#x2F;subuser-default-repository&#x2F;blob&#x2F;master&#x2F;icedove&#x2F;docker-image&#x2F;SubuserImagefile" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;subuser-security&#x2F;subuser-default-reposito...</a>