[Software] Vim youcompleteme and ycmd not working in Python virtual environments

[vazaha]

I'd like to use the youcompleteme plugin for vim code autocompletion, using the package contained in the vim-youcompleteme package in the Debian 12 main repo. In particular, I want to use it on Python scripts running in virtual environments.

I installed the package via

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aptitude install vim-youcompleteme

(which replaced my vim.basic with vim.nox via update-alternatives), and activated it in my vimrc adding:

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packadd youcompleteme

Everything works very fine, besides the case in which I have a Python environment activated: in this case, as soon as vim starts I obtain an error like this:

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2024-03-26 21:54:30,895 - ERROR - The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). Unexpected exit code 1. Type ':YcmToggleLogs ycmd_55813_stderr_y3bl9e36.log' to check the logs.

The stderr log mentioned in the message is empty (I also tried to set

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let g:ycm_server_log_level = 'debug'

in my vimrc but nothing changed).
I checked the youcompleteme documentation and found that the virtual environment case is explicitly treated, so I tried to apply the instructions provided here, but nothing changed. I also tried to play around with the ycm_python_interpreter_path variable testing different python3 binaries, notably I tried to set

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let g:ycm_python_interpreter_path = '<my_python_venv_path>/bin/python3'

(just for testing purpose since it would be an horrible solution) but no improvements here too.

Do you have any idea or any suggestion?

Thanks in advance!