Ubuntu系统树莓派4B上Camera Module 3无法使用问题求助

我手里有一台装了Ubuntu系统的树莓派4B，现在想搭配Camera Module 3用Python的PiCamera库来开发——这套代码在树莓派OS上测试过是完全没问题的。因为需要安装一些外部包，我是在虚拟环境里运行代码的，但一执行就弹出了错误，具体的报错信息如下：

Traceback (most recent call last):

File "/home/flamethrower/Desktop/CameraCode/headshots_picam.py", line 2, in <module>

from picamera import PiCamera

File "/home/flamethrower/cameravenv/lib/python3.11/site-packages/picamera/__init__.py", line 72, in <module>

from picamera.exc import (

File "/home/flamethrower/cameravenv/lib/python3.11/site-packages/picamera/exc.py", line 41, in <module>

import picamera.mmal as mmal

File "/home/flamethrower/cameravenv/lib/python3.11/site-packages/picamera/mmal.py", line 49, in <module>

_lib = ct.CDLL('libmmal.so')

^^^^^^^^^^^^^^^^^^^^^

File "/usr/lib/python3.11/ctypes/__init__.py", line 376, in __init__

self._handle = _dlopen(self._name, mode)

^^^^^^^^^^^^^^^^^^^^^^^^^

OSError: libmmal.so: cannot open shared object file: No such file or directory

------------------

(program exited with code: 1)

我特意试了一段极简的测试代码，结果还是报同样的错误。有没有大佬能给我指点一下该怎么解决这个问题呀？

备注：内容来源于stack exchange，提问作者Flamethrower