Problems running carla on UbuntuStudio 21.04

Question

I don't know why carla is not working anymore on my system.

This is the error msg:

Carla 2.3.2 started, status:
  Python version: 3.9.5
  Qt version:     5.15.2
  PyQt version:   5.15.4
  Binary dir:     /usr/lib/carla
  Resources dir:  /usr/share/carla/resources
Traceback (most recent call last):
  File "/usr/share/carla/carla", line 46, in <module>
    host = initHost(initName, libPrefix, False, False, True)
  File "/usr/share/carla/carla_host.py", line 3227, in initHost
    gCarla.utils = CarlaUtils(utilsname)
  File "/usr/share/carla/carla_utils.py", line 333, in __init__
    self.lib.carla_cocoa_set_transient_window_for.argtypes = [c_uintptr, c_uintptr]
  File "/usr/lib/python3.9/ctypes/__init__.py", line 387, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.9/ctypes/__init__.py", line 392, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib/carla/libcarla_utils.so: undefined symbol: carla_cocoa_set_transient_window_for

I already tried upgrading (Everything is up to date), searching for bugs in the carla GitHub (found nothing relevant) and reinstalling carla.

Really it depends on installation method. Both Carla from official ubuntu repository and from ubuntustudio backports PPA works normally on fresh 21.04 system. What did you have for dpkg -l | grep carla and dpkg -S /usr/lib/carla/libcarla_utils.so before compilation? — N0rbert, Aug 28 '21 at 06:49
Both commands returned the 2.3.0-0ubuntu1 package. But just to be sure I purged all Carla packages and reinstalled. Now everything works! The libcarla_utils.so is the same, but /usr/share/carla/carla_utils.py changed and don't call carla_cocoa_set_transient_window_for anymore — Luis Henriques, Aug 28 '21 at 07:25
To indicate that problem is solved I have added answer below. — N0rbert, Aug 28 '21 at 07:29
Thanks, I added what I did to maybe help others with similar problems. — Luis Henriques, Aug 28 '21 at 07:30

score 1 · Answer 1 · answered Aug 28 '21 at 07:29

My system was in a borked state for some reason. I was able to get fix the problem by running:

sudo apt purge carla
sudo apt autoremove
sudo apt install carla

My guess is I updated /usr/share/carla/* a long time ago and forgot about it. When the system updated, some files got overwritten, but others not.

score 0 · Answer 2 · answered Aug 28 '21 at 07:28

The Carla version in your question indicates that its origin is ubuntustudio backports PPA.

I would recommend to add this PPA and reinstall carla packages by

sudo add-apt-repository ppa:ubuntustudio-ppa/backports
sudo apt-get update
sudo apt-get install --reinstall $(dpkg -l | grep carla | grep ^ii | awk '{print $2}')

Problems running carla on UbuntuStudio 21.04

2 Answers2