I have freshly installed OMV 4 on a fresh Debian Stretch 9.3.0. However, most of the times I install or update a package I receive an error about a Python exception at the end of the apt procedure. I'm not sure it actually creates problems for the workings of the system, but I'd like to correct this message if possible.
Edit: I see that's it a bug in the python version. I tried the manual fix as mentioned in that thread, but it also says in the thread that it didn't help anymore for newer versions. Let's hope it works for me.