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#Lubuntu are switching from the discontinued #LXDE desktop to its replacement, #LXQT, from 18.10 onwards:
https://betanews.com/2018/07/30/ubuntu-linux-lubuntu-old-lxqt/

They have also announced they are dropping support for 32-bit PCs from 19.04 onwards:
https://betanews.com/2018/12/21/lubuntu-linux-32bit/

So 18.04 LTS is the last version of Lubuntu that can be recommended for use with older PCs. #Trisquel 9 will be based off 18.04 LTS, and I presume #Mate will remain the default desktop. Trisquel 8 is what I run (for now) on an ancient 32-bit Acer netbook