LXQT is the merge of lxde (GTK) and razor-qt (Pure QT)
Here’s how to install in Debian Jessie:
Open a new file in nano (eg: /etc/apt/sources.list.d/lxqt.list) and paste the siduction repos.
deb http://packages.siduction.org/lxqt jessie-backports main deb-src http://packages.siduction.org/lxqt jessie-backports main
After you paste simply update and install
apt-key adv --keyserver pgpkeys.mit.edu --recv-key 15CBD88045C45076 aptitude update aptitude install lxqt