Lubuntu 18.04 "Lubuntu Qt session" crashes the system

Bug #1786602 reported by Histesh Shah on 2018-08-11
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lubuntu-default-settings (Ubuntu)
Simon Quigley

Bug Description


At this point in time, Lubuntu is giving the impression that we support the Qt session by shipping it by default. We don't.

Lubuntu Next was never released, and this file should have never been in that binary in a release.

[Test Case]

Test if QLubuntu is an available session to choose on login. It shouldn't be.

[Regression Potential]

None; users shouldn't be using it anyway. Not only is it broken, it's unsupported.

[Original Description]

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 (20180725)
SourcePackage: lxqt-metapackages
UpgradeStatus: No upgrade log present (probably fresh install)

Histesh Shah (chimak111) wrote :
Simon Quigley (tsimonq2) on 2018-08-12
affects: lxqt-metapackages (Ubuntu) → lubuntu-default-settings (Ubuntu)
Simon Quigley (tsimonq2) wrote :

In my opinion as Lubuntu Release Manager, this needs to get in Bionic as soon as possible, especially with the upgrade enablement date coming shortly.

Changed in lubuntu-default-settings (Ubuntu):
status: New → Confirmed
importance: Undecided → Critical
assignee: nobody → Simon Quigley (tsimonq2)
Changed in lubuntu-default-settings (Ubuntu Bionic):
status: New → Confirmed
importance: Undecided → Critical
assignee: nobody → Simon Quigley (tsimonq2)
Changed in lubuntu-default-settings (Ubuntu):
assignee: Simon Quigley (tsimonq2) → nobody
status: Confirmed → Fix Released
description: updated

Hello Histesh, or anyone else affected,

Accepted lubuntu-default-settings into bionic-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at . Thank you in advance!

Changed in lubuntu-default-settings (Ubuntu Bionic):
status: Confirmed → Fix Committed
tags: added: verification-needed verification-needed-bionic

The fix for this bug has been awaiting testing feedback in the -proposed repository for bionic for more than 90 days. Please test this fix and update the bug appropriately with the results. In the event that the fix for this bug is still not verified 15 days from now, the package will be removed from the -proposed repository.

tags: added: removal-candidate
To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers