[MM3-users] makemigrations --merge error after Debian upgrade

Hi, I upgraded my debian version, and since, it seems that I have a problem. I tried mailman-web migrate (and mailman-web collectstatic etc.) and I get the error message:

CommandError: Conflicting migrations detected; multiple leaf nodes in the migration graph: (0010_auto_20220618_2315, 0014_schedule_cluster in django_q; 0014_auto_20220618_2315, 0018_alter_emailtemplate_language in postorius).
To fix them run 'python manage.py makemigrations --merge'

So I tried mailman-web makemigrations --merge that ended with

PermissionError: [Errno 13] Permission denied: '/usr/lib/python3/dist-packages/postorius/migrations/0019_merge_20240930_1159.py'

There is no such a file in the migration directory. Any idea ?

Thanks in advance, All the best

Maxime Chupin