Yesterdays DU wanted to remove Lxqt and I let it go thinking there would be a fix later. However it looks like a bit of a mystery. Trying to install using metapackage fails but all the modules can be installed except lxqt-qtplugin which fails because of qtbase-abi which is part of libqtcore5a 5.4.2+dfsg-9 which doesn't seem to exist. I expect there will be a fix soon.
I have since installed Razorqt and it is very good a lot better than when I last looked at it some time ago.