$ sudo apt-get install git
$ git clone https://github.com/samwhelp/play-ubuntu-18.04-plan.git
$ cd play-ubuntu-18.04-plan
$ cd plan/de-basic/play-lxqt
$ make prepare
$ make deb-build
$ make deb-install
$ mod-lxqt
or
$ mod-lxqt help
$ mod-lxqt install