March 16th 2018 saw the release of LyX 2.3.0. LyX s a document processor which acts as a more friendly front end to the LaTeX typesetting system.
More information can be found on the LyX website news page announcing this release.
LyX is available for Mac, Windows and Multiple GNU / Linux distributions. I will try and contact the Mint forums and ask if it is possible to include the new build in Mint 19. or the latest current release branch.