How do I get Lubuntu 16.04 to run faster?
(For a friend I installed Lubuntu 16.04 -- supported till April 2021) -- in a on an old iBook G4, which runs on PowerPC.)
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Lubuntu 16.04 LTS has, indeed, passed its End of Public Support, as per its own blog: Lubuntu 16.04 LTS (Xenial Xerus) Released! says "Lubuntu 16.04 LTS will be supported until April 2019, with three years of support."
Therefore, suggest you follow this procedure to upgrade the supported Ubuntu 16.04 LTS with the new LXQt desktop.