I’ve found a solution (but I haven’t found the cause…) so I’m replying myself, maybe someone can take advantage of this.
Reading about similar problem on GitHub here, i’ve tried to change “packaging” package of Python3 to version 22, using this command:
I would like to thank you immensely.
After having my server hacked due to a lack of CSF, I tried every way to upgrade the system and was unable to do so.
After many hours of research, I found your answer. Thank you very much.