lxpanel crashes when switching to from 2 monitors to laptop lcd only

[Lyn Perrine]

To reproduce install lubuntu 17.04 and then plug in an external monitor. Run lxrandr to set the monitor above the laptop lcd. Then change lxpanel to be on monitor 2 so it shows up on the lower monitor. Then in lxrandr after using the laptop with external screen open lxrandr and try to use the laptop lcd only and lxpanel crashes.

lxpanel:
  Installed: 0.9.3-1ubuntu1
  Candidate: 0.9.3-1ubuntu1
  Version table:
 *** 0.9.3-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu zesty/universe amd64 Packages
        100 /var/lib/dpkg/status
Description: Ubuntu Zesty Zapus (development branch)
Release: 17.04
lxrandr:
  Installed: 0.3.1-1
  Candidate: 0.3.1-1
  Version table:
 *** 0.3.1-1 500
        500 http://us.archive.ubuntu.com/ubuntu zesty/universe amd64 Packages
        100 /var/lib/dpkg/status

I expected to return to the one panel way lubuntu is by default.

ProblemType: Crash
DistroRelease: Ubuntu 17.04
Package: lxpanel 0.9.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Uname: Linux 4.10.0-9-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Config_Home_Lubuntu:
 [Command]
 Logout=lxsession-default quit
CurrentDesktop: LXDE
Date: Thu Mar 16 18:49:01 2017
ExecutablePath: /usr/bin/lxpanel
ProcCmdline: lxpanel --profile Lubuntu
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: lxpanel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 __strftime_internal (s=0x7ffe59b29f80 "", maxsize=64, format=0x6d61726170207478 <error: Cannot access memory at address 0x6d61726170207478>, tp=0x7f2c770924a0 <_tmbuf>, tzset_called=tzset_called@entry=0x7ffe59b29f5f, loc=0x7f2c7708e400 <_nl_global_locale>) at strftime_l.c:549
 __GI___strftime_l (s=<optimized out>, maxsize=<optimized out>, format=<optimized out>, tp=<optimized out>, loc=<optimized out>) at strftime_l.c:459
 dclock_update_display ()
 ?? ()
 ?? ()

[Chris Guiver (guiverc)]

Thank you for reporting this bug to Ubuntu.

Ubuntu 17.04 (zesty) reached end-of-life on January 13, 2018.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.

[Launchpad Janitor (janitor)]

[Expired for lxpanel (Ubuntu) because there has been no activity for 60 days.]