https://lists.debian.org/debian-release/2015/09/msg00241.html
https://lists.debian.org/debian-devel/2015/09/msg00148.html
Edited a few hours later. Dist-Upgrade 133 upgrade 33 new 27 remove 2 not to upgrade GCC6 here we go and it went very smoothly and I got back a functional lxqt. as noted above - some programs you had might have been removed. Especially if you are testing kde5