Updating TexLive from Ubuntu/Mint

[UD]

This is not a new topic, and this is probably not the right place to ask, but how do I update TexLive in Ubuntu (15.10) or Mint (17.3)?  When TexLive is installed via Ubuntu, there is no package manager, and Ubuntu discourages package management that is done outside of its own package management. Thanks E.Kaplan --