Cura: Crash when adding new printer. (Ubuntu 16.04) (2.3.0 PPA)

[opensourcefan]

I'm having all kinds of issues with 2.3.0 after updating it today. It's not functional at all with many different interactions causing freezing. I also get tons of warnings and debugs on the start of Cura from Terminal.

This is the Terminal output when I try and add a new printer. It results in a hang with the gui becoming greyed out. Force Quit is required.

file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null qml: qml: qml: 2016-09-11 15:50:17,858 - WARNING - .../UM/Settings/ContainerRegistry.py (addContainer [219]): Container of type <class 'UM.Settings.InstanceContainer.InstanceContainer'> and id Custom FDM printer_variant already added 2016-09-11 15:50:17,917 - DEBUG - /usr/lib/cura/plugins/CuraEngineBackend/CuraEngineBackend.py (_onBackendQuit [412]): Backend quit with return code 127. Resetting process and socket. 2016-09-11 15:50:17,918 - DEBUG - .../UM/Backend/Backend.py (_createSocket [206]): Previous socket existed. Closing that first.

[opensourcefan]

Here's another output from Terminal re this. In this instance I tried to add the Prusa_i3 printer. Upon hitting the add printer button it froze.

file:///usr/share/cura/resources/qml/AddMachineDialog.qml:105: ReferenceError: sortedMachineDefinitionsModel is not defined file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null file:///usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/Menu.qml:149: TypeError: Cannot read property '__contentItem' of null qml: 2016-09-11 16:56:53,905 - WARNING - .../UM/Mesh/MeshBuilder.py (reserveFaceCount [158]): Had to convert 'num_faces' with int(): 2684.0 -> 2684 qml: qml: 2016-09-11 16:56:54,086 - DEBUG - .../UM/Mesh/MeshData.py (calculateNormalsFromVertices [339]): Calculating normals took 0.0005602836608886719 seconds 2016-09-11 16:56:54,087 - DEBUG - /usr/lib/uranium/plugins/FileHandlers/STLReader/STLReader.py (read [35]): Loaded a mesh with 8052 vertices Terminated

[fieldOfView]

The freezes sound like the QT deadlock. @thopiekar, what version of pyqt is used with the ppa?

[thopiekar]

@fieldOfView: My stable PPA comes with no PyQt5 at all. Installing 2.3 from there uses the PyQt5 version, which comes with Ubuntu. In case Ubuntu Xenial is used:

• http://packages.ubuntu.com/de/xenial/python3-pyqt5

@opensourcefan Which Ubuntu version are you using? And which PPA?
(I often hear from people using master PPA and they expect to see no bugs. At the moment master <> 2.3 are almost the same, so there should be no real difference.)

[opensourcefan]

I'm on 16.04 (Xenial)

[thopiekar]

Are you familiar with advanced package managers, like Synaptic?

[opensourcefan]

Yes, I have it installed. Don't use it much though.

[opensourcefan]

Current Python version is 2.7.12 which I think was installed from the previous 2.1.3 cura PPA.

[thopiekar]

Please enable my master PPA and install PyQt 5.6 from there (not Cura, etc.).
If it works I can copy PyQt 5.6 from there into stable.

[thopiekar]

In case it works, I should better remove all packages for Ubuntu versions older than Xenial (16.04) just before other people get problems with that.

[opensourcefan]

Is this what you want enabled?
ppa:thopiekar/cura-master

I've enabled it but can find PyQt 5.6 anywhere. I have apt-get updated.

Although I do see it there....

[thopiekar]

There should be PyQt 5.6:

• https://launchpad.net/~thopiekar/+archive/ubuntu/cura-master/+packages?field.name_filter=&field.status_filter=published&field.series_filter=xenial

[thopiekar]

I'm getting these locks (in settings UI) on my notebook, too. I'll try it also on my own..

[thopiekar]

[thopiekar]

Now no locks here anymore. @opensourcefan, can you confirm this?

[opensourcefan]

I just installed pyqt5, how would you like me to check exactly. I'll start it up and see, if there's something specific you would like me to check please advise.

[opensourcefan]

I've added and taken away a few printers and all is well, no more lock ups.

[opensourcefan]

No more locks, seems good now.

[thopiekar]

Ok, now just disable the master PPA again. I'll publish PyQt 5.6 in my stable PPA soon.

[thopiekar]

@opensourcefan Thank you for your feedback :+1:

[opensourcefan]

Thank you for the excellent work!

[thopiekar]

No problem :ok_hand:

[thopiekar]

Just kept this open so I don't forget to remove all the packages for Ubuntu < 16.04.

However, done that now, so let's wait for the blame that packages for Ubuntu Wily or Vivid are not there anymore :see_no_evil: