Ubuntu
lubuntu-default-settings package

Lubuntu 18.04 "Lubuntu Qt session" crashes the system

Bug #1786602 reported by Histesh Shah
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lubuntu-default-settings (Ubuntu)
Fix Released
Critical
Unassigned
Bionic
Fix Released
Critical
Simon Quigley

Bug Description

[Impact]

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
Exec=/usr/bin/startlxqt
Type=Application

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)

See original description
Revision history for this message
Histesh Shah (chimak111) wrote :
Simon Quigley (tsimonq2)
affects: lxqt-metapackages (Ubuntu) → lubuntu-default-settings (Ubuntu)
Revision history for this message
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
Revision history for this message
Łukasz Zemczak (sil2100) wrote : Please test proposed package

Hello Histesh, or anyone else affected,

Accepted lubuntu-default-settings into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/lubuntu-default-settings/0.54.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in lubuntu-default-settings (Ubuntu Bionic):
status: Confirmed → Fix Committed
tags: added: verification-needed verification-needed-bionic
Revision history for this message
Brian Murray (brian-murray) wrote : [lubuntu-default-settings/bionic] verification still needed

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
Revision history for this message
Łukasz Zemczak (sil2100) wrote : Proposed package removed from archive

The version of lubuntu-default-settings in the proposed pocket of Bionic that was purported to fix this bug report has been removed because the bugs that were to be fixed by the upload were not verified in a timely (105 days) fashion.

tags: removed: verification-needed-bionic
Changed in lubuntu-default-settings (Ubuntu Bionic):
status: Fix Committed → Won't Fix
tags: removed: verification-needed
Revision history for this message
Simon Quigley (tsimonq2) wrote :

I sincerely apologize for the delay in a follow-up fix here. 0.54.2, which has now been uploaded to the queue, should fix the FTBFS and allow this to proceed.

Revision history for this message
Adam Conrad (adconrad) wrote : Please test proposed package

Hello Histesh, or anyone else affected,

Accepted lubuntu-default-settings into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/lubuntu-default-settings/0.54.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Changed in lubuntu-default-settings (Ubuntu Bionic):
status: Won't Fix → Fix Committed
tags: added: verification-needed verification-needed-bionic
Revision history for this message
Chris Guiver (guiverc) wrote :

installed, logged out and now at greeter screen (or login screen) I have no Qt option anymore.

guiverc@755-lubu:~$ apt-cache policy lubuntu-default-settings
lubuntu-default-settings:
  Installed: 0.54.2
  Candidate: 0.54.2
  Version table:
 *** 0.54.2 500
        500 http://ftp.iinet.net.au/pub/ubuntu bionic-proposed/universe i386 Packages
        100 /var/lib/dpkg/status
     0.54 500
        500 http://ftp.iinet.net.au/pub/ubuntu bionic/universe i386 Packages

tags: added: verification-done-bionic
removed: verification-needed-bionic
Revision history for this message
Chris Guiver (guiverc) wrote :

before installation of -proposed updates, I had "Lubuntu Qt session" option at greeter, after lubuntu-default-settings from -proposed was installed, that option was gone.

guiverc@dx6120-xu:~$ apt-cache policy lubuntu-default-settings
lubuntu-default-settings:
  Installed: 0.54.2
  Candidate: 0.54.2
  Version table:
 *** 0.54.2 500
        500 http://ftp.iinet.net.au/pub/ubuntu bionic-proposed/universe i386 Packages
        100 /var/lib/dpkg/status
     0.54 500
        500 http://ftp.iinet.net.au/pub/ubuntu bionic/universe i386 Packages

my bad - I thought prior test was x86_64; my intention was different arch but missed :(

Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package lubuntu-default-settings - 0.54.2

---------------
lubuntu-default-settings (0.54.2) bionic; urgency=medium

  * Remove /usr/share/xsessions/QLubuntu.desktop from
    lubuntu-default-settings.install so dh_missing does not make the build
    FTBFS (LP: #1786602).

 -- Simon Quigley <email address hidden> Sun, 03 Feb 2019 23:56:24 -0600

Changed in lubuntu-default-settings (Ubuntu Bionic):
status: Fix Committed → Fix Released
Revision history for this message
Adam Conrad (adconrad) wrote : Update Released

The verification of the Stable Release Update for lubuntu-default-settings has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

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