Dear Maintainer,

 I installed the latest cura, typed 'cura' in a terminal window, and got a heap of debug messages, but no cura window.

 Some  messages that may be relevant:
2024-06-25 09:12:27,979 - ERROR - [MainThread] UM.PluginRegistry._findPlugin [730]: Exception: Import error loading module TrimeshReader
2024-06-25 09:12:27,980 - ERROR - [MainThread] UM.PluginRegistry._findPlugin [730]: Traceback (most recent call last):
2024-06-25 09:12:27,981 - ERROR - [MainThread] UM.PluginRegistry._findPlugin [730]:   File "/usr/lib/python3/dist-packages/UM/PluginRegistry.py", line 728, in _findPlugin
2024-06-25 09:12:27,981 - ERROR - [MainThread] UM.PluginRegistry._findPlugin [730]:     module = imp.load_module(plugin_id, file, path, desc)  # type: ignore #MyPy gets the wrong output type from imp.find_module for some reason.
 2024-06-25 09:12:29,758 - ERROR - [MainThread] UM.Qt.QtApplication.createQmlComponent [606]: file:///usr/lib/cura/plugins/ModelChecker/ModelChecker.qml:8:1: Type UM.SimpleButton unavailable

I'm also having this problem as of recently. I tried building the
package myself from source (the Debian version, not upstream) and still
had the problem. It's probably related to a recent upgrade of one of
Cura's dependencies. I wasn't able to get upstream to build, but if I do
I will report back here.

Since this bug makes the package unusable, I think the severity should
be grave. I am not sure whether anyone is able to change that, but I
have added the control header in case it works, because I think it's
pretty clear that the severity should be grave.

Thanks,
Asher

I have a local build of python3-trimesh (which isn't packaged for Debian yet) installed and also get this issue.

Since we haven't updated Cura in a while, I suspect it's something else that broke it. Qt6 maybe?

I think think the interesting part is this here:

qt.qml.typeresolution.cycle: Cyclic dependency detected between "file:///usr/share/cura/resources/qml/Actions.qml" and "file:///usr/share/cura/resources/qml/Actions.qml"
QQmlApplicationEngine failed to load component
2024-06-30 10:11:17,960 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [431]: file:///usr/share/cura/resources/qml/Cura.qml:277:13: Type JobSpecs unavailable
2024-06-30 10:11:17,960 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [431]: file:///usr/share/cura/resources/qml/JobSpecs.qml:44:9: Type UM.SimpleButton unavailable
2024-06-30 10:11:17,961 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [431]: file:///usr/lib/python3/dist-packages/UM/Qt/qml/UM/SimpleButton.qml:30:5: ColorImage is not a type
2024-06-30 10:11:17,981 - DEBUG - [MainThread] UM.Controller.setActiveStage [180]: Setting active stage to PrepareStage
2024-06-30 10:11:17,981 - DEBUG - [MainThread] UM.Controller.setActiveView [108]: Setting active view to SolidView
2024-06-30 10:11:17,983 - DEBUG - [MainThread] ModelChecker.ModelChecker._createView [118]: Creating model checker view.
QQmlComponent: Component is not ready
2024-06-30 10:11:17,985 - ERROR - [MainThread] UM.Qt.QtApplication.createQmlComponent [606]: file:///usr/lib/cura/plugins/ModelChecker/ModelChecker.qml:8:1: Type UM.SimpleButton unavailable
2024-06-30 10:11:17,986 - ERROR - [MainThread] UM.Qt.QtApplication.createQmlComponent [606]: file:///usr/lib/python3/dist-packages/UM/Qt/qml/UM/SimpleButton.qml:30:5: ColorImage is not a type

I think I've tracked down the issue.

UM/Qt/qml/UM/SimpleButton.qml references a UI element called "ColorImage".
This class exists in Qt, but it's private and was probably changed/removed in Qt6.

However, there's also a ColorImage class in Uranium (Cura's UI toolkit), and I suspect they actually wanted to use that, but forgot to reference the correct type.

They actually fixed this upstream: https://github.com/Ultimaker/Uranium/commit/88fd460a63263d66173f1e0127b0f208577d7f4e

I'm going to add this patch to the Uranium package.

We believe that the bug you reported is fixed in the latest version of
uranium, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1074239@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Gregor Riepl <onitake@gmail.com> (supplier of updated uranium package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 09 Jul 2024 10:42:06 +0200
Source: uranium
Architecture: source
Version: 5.0.0-5
Distribution: unstable
Urgency: medium
Maintainer: Debian 3-D Printing Packages <3dprinter-general@lists.alioth.debian.org>
Changed-By: Gregor Riepl <onitake@gmail.com>
Closes: 1074239 1074752
Changes:
 uranium (5.0.0-5) unstable; urgency=medium
 .
   * Replace usage of deprecated imp module. (Closes: #1074752)
   * Use Uranium ColorImage class. (Closes: #1074239)
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 72b5590b1caed65a6c6036a3f9206ae5 9472 python optional uranium_5.0.0-5.debian.tar.xz
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