package install on Ubuntu 20.04 not working

[auturgy]

Fresh install on Ubuntu 20.04 not working
Steps to reproduce:
sudo apt install morse-simulator
morse create my_first_sim
morse run my_first_sim

Full console dump (of a different run, but same error) is at shorturl.at/svJM6
but basically Blender quits due to uncaught exception,
AttributeError: 'Object' object has no attribute 'hide'.

09:23 $ morse --version
morse 1.4

09:23 $ morse check

• Checking up your environment...
• Running on Linux. Alright.
• Found MORSE libraries in '/usr/lib/python3/dist-packages/morse/blender'. Alright.
• Trying to figure out a prefix from the script location...
• Default scene found. The prefix seems ok. Using it.
• Setting $MORSE_ROOT environment variable to default prefix [/usr/]
• Checking version of /usr/bin/blender... Found v.2.82.7
• Version 2.82.7 of Blender is untested but should work
• Found Blender in your PATH
  (/usr/bin/blender, v.2.82.7).
  Alright, using it.
• Checking version of Python within Blender /usr/bin/blender... Found v.3.8.2
• Blender and Morse are using Python 3.8.2. Alright.
• Your environment is correctly setup to run MORSE.

[dgerod]

My first impression is that Blender API used in Morse is not compatible with your Blender version (2.82.7), MORSE is complaining about a missed attribute "hide". But, I have not checked in detail.

I use version 2.78c. So, could yo use an older Blender version? You could try with several ones, from 2.78c to 2.82.7, if you are interested in having latest Blender version.

[severin-lemaignan]

The Blender game engine has been removed from Blender 2.8x, and MORSE can not run without it. The last version of Blender that should work is 2.79.

[dgerod]

@severin-lemaignan, this important information about Blender/BGE version should be written in the README to avoid people to have this problem.

[severin-lemaignan]

Indeed. Can you send a quick PR with this information?

[xinkai-jiang]

Hi,

I met the same problem, but I change the version of the blender to 2.79b and then this exception was disappeared.

However, I meet another problem, when I run the first demo

morse run my_first_sim

It came out Segmentation fault

/usr/local/bin/morse:340: DeprecationWarning: The SafeConfigParser class has been renamed to ConfigParser in Python 3.2. This alias will be removed in future versions. Use ConfigParser directly instead.
  config = configparser.SafeConfigParser()
* Adding </home/robot/my_first_sim> to PYTHONPATH and MORSE_RESOURCE_PATH.

* Using default scene in environment <my_first_sim>.

* morse 1.4

* Version 2.79.0 of Blender is untested but should work

/usr/local/bin/morse:302: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn("Blender's Python version could not be determined. "
* Blender's Python version could not be determined. Crossing fingers.

found bundled python: /home/robot/libraries/blender-2.79b/2.79/python
Read blend: /usr/local/share/morse/data/morse_default_autorun.blend
Writing: /tmp/morse_default_autorun.crash.txt
Segmentation fault (core dumped)

Did you meet before and how did you solve it?

Thank you.

[severin-lemaignan]

Can you post the content of /tmp/morse_default_autorun.crash.txt?

[xinkai-jiang]

Sorry, I change another machine using ubuntu 18.04 and fix all the problems, I guess it might related to ubuntu version.
But in the previous environment, I cannot recover the exception before, and it came out with another fault.

/usr/local/bin/morse:340: DeprecationWarning: The SafeConfigParser class has been renamed to ConfigParser in Python 3.2. This alias will be removed in future versions. Use ConfigParser directly instead.
  config = configparser.SafeConfigParser()
* Adding </home/robot/my_first_sim> to PYTHONPATH and MORSE_RESOURCE_PATH.

* Using default scene in environment <my_first_sim/>.

* morse 1.4

* Version 2.79.0 of Blender is untested but should work

/usr/local/bin/morse:302: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn("Blender's Python version could not be determined. "
* Blender's Python version could not be determined. Crossing fingers.

found bundled python: /home/robot/libraries/blender-2.79b/2.79/python
Fatal Python error: Py_Initialize: can't initialize sys standard streams
Traceback (most recent call last):
  File "/usr/lib/python3.8/io.py", line 52, in <module>
  File "/usr/lib/python3.8/abc.py", line 106
    print(f"Class: {cls.__module__}.{cls.__qualname__}", file=file)
                                                      ^
SyntaxError: invalid syntax
Aborted (core dumped)

But I guess it didn't write to /tmp/morse_default_autorun.crash.txt so I copy this file below for your reference.

# Blender 2.79 (sub 0), Commit date: 2018-03-22 14:10, Hash f4dc9f9d68b
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.logic.sensor_add(type='ALWAYS', name="MORSE_LOGIC")  # Operator
bpy.ops.logic.controller_add(type='PYTHON')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.empty_add(type='ARROWS', view_align=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.logic.sensor_add(type='ALWAYS', name="MORSE_LOGIC")  # Operator
bpy.ops.logic.controller_add(type='PYTHON')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.empty_add(type='ARROWS', view_align=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.logic.sensor_add(type='ALWAYS', name="MORSE_LOGIC")  # Operator
bpy.ops.logic.controller_add(type='PYTHON')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.empty_add(type='ARROWS', view_align=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.logic.sensor_add(type='ALWAYS', name="MORSE_LOGIC")  # Operator
bpy.ops.logic.controller_add(type='PYTHON')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.mesh.primitive_cube_add(view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator
bpy.ops.material.new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.empty_add(type='ARROWS', view_align=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.game_property_new()  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.object.select_all(action='DESELECT')  # Operator
bpy.ops.mesh.primitive_cube_add(view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))  # Operator

# backtrace
/home/robot/libraries/blender-2.79b/blender(BLI_system_backtrace+0x20) [0x1a6c700]
/home/robot/libraries/blender-2.79b/blender() [0x1078395]
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7f51a0416210]