Public bug reported:

Immediately after choosing "Lubuntu Qt" session at login time, a small window 
appears with the message:
unable to launch "/usr/bin/startlxqt" as session --- "/usr/bin/startlxqt" not 
found; falling back to default session. 

There's an "Okay" button. After pressing the button, the system crashes.

In /usr/share/xsessions, there are three files:
Lubuntu.desktop  openbox.desktop  QLubuntu.desktop

The content of QLubuntu.desktop are:
[Desktop Entry]
Name=Lubuntu Qt session
Comment=A specific Lubuntu session using Qt

I suggest that QLubuntu.desktop be removed from future point releases of
Lubuntu 18.04, or earlier if possible, so that users cannot login into
the session it appears to provide.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lxqt (not installed)
ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: LXDE
Date: Sat Aug 11 15:08:54 2018
InstallationDate: Installed on 2018-08-11 (0 days ago)
InstallationMedia: Lubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
SourcePackage: lxqt-metapackages
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lxqt-metapackages (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Lubuntu 18.04 "Lubuntu Qt session" crashes the system

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