If I using Mate Menu applet my panel, always me presents an Unbound Local Error exception

[Attila Hammer]

Dear Developers,

If I using Mate Menu applet, me always presents following traceback error message after login:
Unable to set the plugin system_management :
Traceback (most recent call last):

  File "/usr/lib/mate-menu/mate-menu.py", line 315, in PopulatePlugins
    MyPlugin.do_plugin()

  File "/usr/lib/python2.7/dist-packages/mate_menu/plugins/system_management.py", line 206, in do_plugin
    self.do_standard_items()

  File "/usr/lib/python2.7/dist-packages/mate_menu/plugins/system_management.py", line 154, in do_standard_items
    Button2.show()

UnboundLocalError: local variable 'Button2' referenced before assignment

If I this situation click OK button, Mate Menu applet me works fine, possible using the search bar, etc.
Please fix this error if this is possible.

Attila

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mate-menu 5.7.1-1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic i686
ApportVersion: 2.20.1-0ubuntu2
Architecture: i386
CurrentDesktop: MATE
Date: Tue Apr 26 10:52:55 2016
InstallationDate: Installed on 2016-04-22 (4 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release i386 (20160419.1)
PackageArchitecture: all
SourcePackage: mate-menu
UpgradeStatus: No upgrade log present (probably fresh install)

[Attila Hammer (hammera)]

I think I founded why happening this exception.
After installation, I removed the mate-welcome package. Because my
system not present following files, happened the reported exception:
/usr/bin/synaptic-pkexec, /usr/bin/software-center,
/usr/share/applications/ubuntu-mate-software.desktop
Real my machine not installed Synaptic, software-center or the
mate-welcome package, with ships the ubuntu-mate-software utility.
If I installing for example the synaptic package, the exception is not
happening.
Same result if I turning off the Show package manager related GSettings
preference the mate-plugin related, following the GSettings schema and name:
Schema name: org.mate.mate-menu.plugins.system_management
Setting name: show-package-manager
Default value: true

Following code part affected the exception related if one of the
examined packages not installed:
     def do_standard_items( self ):

         if ( self.showPackageManager == True ):
             if os.path.exists("/usr/bin/synaptic-pkexec"):
                 Button2 = easyButton("synaptic", self.iconsize,
[_("Package Manager")], -1, -1 )
                 Button2.connect( "clicked", self.ButtonClicked,
"/usr/bin/synaptic-pkexec" )
             elif os.path.exists("/usr/bin/software-center"):
                 Button2 = easyButton("softwarecenter", self.iconsize,
[_("Package Manager")], -1, -1 )
                 Button2.connect( "clicked", self.ButtonClicked,
"/usr/bin/software-center" )
             elif
os.path.exists("/usr/share/applications/ubuntu-mate-software.desktop"):
                 Button2 = easyButton("system-software-install",
self.iconsize, [_("Package Manager")], -1, -1 )
                 Button2.connect("clicked", self.ButtonClicked,
"/usr/bin/ubuntu-mate-welcome --software-only")
             Button2.show()
             self.systemBtnHolder.pack_start( Button2, False, False, 0 )
             self.mateMenuWin.setTooltip( Button2, _("Install, remove
and upgrade software packages") )

Attila

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Patrick Banholzer (patrick-banholzer)]

I can confirm, that the workaround to uncheck the packagemanagement in the system tab eliminates this issue.

Nontheless it would be nice, if mate-menu would check if synaptic is there. And if there is no synaptic disable this checkbox.

[UV (uvwild)]

just for reference:
on a new installed ubuntu 16.04.3 LTS with mate desktop in feb 2018 this bug is still there!
Linux hostname 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

But there is a new version:
https://ubuntu-mate.org/blog/mate-desktop-116-for-xenial-xerus/
$ dpkg -l | grep mate
ii gir1.2-mate-panel 1.12.2-1 amd64 GObject introspection data for MATE panel
ii libmate-desktop-2-17:amd64 1.12.1-1 amd64 Library with common API for various MATE modules (library)
ii libmate-menu2:amd64 1.12.0-1 amd64 implementation of the freedesktop menu specification for MATE (library)
ii libmate-panel-applet-4-1 1.12.2-1 amd64 library for MATE Panel applets
ii libmate-slab0:amd64 1.12.1-2 amd64 beautification app library
ii libmate-window-settings1:amd64 1.12.1-2 amd64 utilities to configure the MATE desktop (window settings library)
ii libmatedict6 1.12.0-1 amd64 MATE desktop utilities (matedict library)
ii libmatekbd-common 1.12.1-1 all MATE library to manage keyboard configuration (common files)
ii libmatekbd4:amd64 1.12.1-1 amd64 MATE library to manage keyboard configuration
ii libmatemixer-common 1.12.1-1 all Mixer library for MATE Desktop (common files)
ii libmatemixer0:amd64 1.12.1-1 amd64 Mixer library for MATE Desktop
ii libmateweather-common 1.12.2-0ubuntu1 all MateWeather shared library (common files)
ii libmateweather1:amd64 1.12.2-0ubuntu1 amd64 MateWeather shared library
ii mate-applets 1.12.1-1 amd64 Various applets for the MATE panel
ii mate-applets-common 1.12.1-1 all Various applets for the MATE panel (common files)
ii mate-backgrounds 1.12.0-1 all Set of backgrounds packaged with the MATE Desktop Environment
ii mate-common 1.12.0-1 all common scripts and macros to develop with MATE
ii mate-control-center 1.12.1-2 amd64 utilities to configure the MATE desktop
ii mate-control-center-common 1.12.1-2 all utilities to con...

[Damodar Das (damodaranudas)]

Same issue here, Ubuntu mate 16.04.4 LTS AMD64

Couldn't initialize plugin system_management : Traceback (most recent call last):

  File "/usr/lib/mate-menu/mate-menu.py", line 315, in PopulatePlugins
    MyPlugin.do_plugin()

  File "/usr/lib/python2.7/dist-packages/mate_menu/plugins/system_management.py", line 206, in do_plugin
    self.do_standard_items()

  File "/usr/lib/python2.7/dist-packages/mate_menu/plugins/system_management.py", line 154, in do_standard_items
    Button2.show()

UnboundLocalError: local variable 'Button2' referenced before assignment

[Martin Wimpress  (flexiondotorg)]

Ubuntu MATE 16.04 is end of life and since that time MATE Menu has been ported to GTK3. We won't be revisiting this issue. Sorry.