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Kivy on Ubuntu 20.04 : Couldn't connect to X server

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Today i set up a WSL2 subsystem on my windows machine running the default Ubuntu 20.04.5 version. The reason i did this was that on my windows machine the kivy applications run really slow (and couldn't find an easy solution to that).

So i setup the WSL2 subsystem then installed pip and venv via sudo apt procedure, and created a virtual environment (LogPor). With (LogPor) activated i used pip to install kivy and opencv-python. I cloned my git repository and tried to run the python file containing the kivy app but the following error message occured:

(LogPor) gianluca@DESKTOP-____:~/PythonProjects/Logic_Portable/LogicPortable$ python3 GUI_DropDown_python.py [INFO   ] [Logger      ] Record log in /home/gianluca/.kivy/logs/kivy_22-10-07_1.txt [INFO   ] [Kivy        ] v2.1.0 [INFO   ] [Kivy        ] Installed at "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/__init__.py" [INFO   ] [Python      ] v3.8.10 (default, Jun 22 2022, 20:18:18) [GCC
9.4.0] [INFO   ] [Python      ] Interpreter at "/home/gianluca/Envs/LogPor/bin/python3" [INFO   ] [Logger      ] Purge log fired. Processing... [INFO   ] [Logger      ] Purge finished! [INFO   ] [Factory     ] 189 symbols loaded [INFO   ] [ImageLoaderFFPy] Using ffpyplayer 4.3.5 [INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_ffpyplayer [INFO   ] [Text        ] Provider: sdl2 [INFO   ] [Camera      ] Provider: opencv(['camera_picamera', 'camera_gi'] ignored)  --- Logging error
---  Traceback (most recent call last):    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/providers/__init__.py", line 41, in <module>
     import kivy.input.providers.mtdev    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/providers/mtdev.py", line 94, in <module>
     from kivy.lib.mtdev import Device, \    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/lib/mtdev.py", line 30, in <module>
     libmtdev = cdll.LoadLibrary('libmtdev.so.1')    File "/usr/lib/python3.8/ctypes/__init__.py", line 451, in LoadLibrary
     return self._dlltype(name)    File "/usr/lib/python3.8/ctypes/__init__.py", line 373, in __init__
     self._handle = _dlopen(self._name, mode)  OSError: libmtdev.so.1: cannot open shared object file: No such file or directory

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):    File "/usr/lib/python3.8/logging/__init__.py", line 1085, in emit
     msg = self.format(record)    File "/usr/lib/python3.8/logging/__init__.py", line 929, in format
     return fmt.format(record)    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/logger.py", line 291, in format
     record = copy.deepcopy(record)    File "/usr/lib/python3.8/copy.py", line 172, in deepcopy
     y = _reconstruct(x, memo, *rv)    File "/usr/lib/python3.8/copy.py", line 270, in _reconstruct
     state = deepcopy(state, memo)    File "/usr/lib/python3.8/copy.py", line 146, in deepcopy
     y = copier(x, memo)    File "/usr/lib/python3.8/copy.py", line 230, in _deepcopy_dict
     y[deepcopy(key, memo)] = deepcopy(value, memo)    File "/usr/lib/python3.8/copy.py", line 146, in deepcopy
     y = copier(x, memo)    File "/usr/lib/python3.8/copy.py", line 210, in _deepcopy_tuple
     y = [deepcopy(a, memo) for a in x]    File "/usr/lib/python3.8/copy.py", line 210, in <listcomp>
     y = [deepcopy(a, memo) for a in x]    File "/usr/lib/python3.8/copy.py", line 161, in deepcopy
     rv = reductor(4)  TypeError: cannot pickle 'traceback' object  Call stack:    File "GUI_DropDown_python.py", line 11, in <module>
     from kivy.uix.dropdown import DropDown    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked    File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/uix/dropdown.py", line 99, in <module>
     from kivy.core.window import Window    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked    File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/core/window/__init__.py", line 2460, in <module>
     Window = core_select_lib('window', window_impl, True)    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
     mod = importlib.__import__(name='{2}.{0}.{1}'.format(    File "<frozen importlib._bootstrap>", line 1093, in __import__    File "<frozen importlib._bootstrap>", line 1014, in _gcd_import    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/core/window/window_sdl2.py", line 34, in <module>
     from kivy.input.provider import MotionEventProvider    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked    File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/__init__.py", line 30, in <module>
     from kivy.input.postproc import kivy_postproc_modules    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/postproc/__init__.py", line 15, in <module>
     from kivy.input.postproc.calibration import InputPostprocCalibration    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked    File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/postproc/calibration.py", line 51, in <module>
     from kivy.input import providers    File "<frozen importlib._bootstrap>", line 1042, in _handle_fromlist    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "<frozen importlib._bootstrap>", line 991, in _find_and_load    File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked    File "<frozen importlib._bootstrap>", line 671, in _load_unlocked    File "<frozen importlib._bootstrap_external>", line 848, in exec_module    File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed    File "/home/gianluca/Envs/LogPor/lib/python3.8/site-packages/kivy/input/providers/__init__.py", line 44, in <module>
     Logger.exception(err)  Message: 'Input: MTDev is not supported by your version of linux'  Arguments: () [INFO   ] [Window      ] Provider: sdl2 [INFO   ] [Window      ] Provider: x11(['window_sdl2'] ignored) Couldn't connect to X server
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Searching further on the internet i came across a possible reason: WSL2 on windows10 doesn't support any sort of GUI as part of the standard installation. A way to get around it is to [install](https://medium.com/javarevisited/using-wsl-2-with-x-server-linux-on-windows-a372263533c3) an X-server on windows and "terminator" on Ubuntu. I didn't try it myself and before doing it i wanted to ask if this solution is enough to run graphic intense(?) kivy apps? Also consider that with windows11 this is fixed as GUI is already supported in WSL2. I cannot upgrade to Windows11 due to TPM 2.0 issues.
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