[MM3-users] Issues with starting mailman 3 outside of a virtualenv

Hello, I wonder if this issue(https://gitlab.com/mailman/mailman/issues/3) was fixed? I try to set up a mailing list on aws ec2(ubuntu). In the instruction( http://docs.mailman3.org/en/latest/prodsetup.html), it doesn't require to install mailman in a virtual env. However, when I tried to run mailman start, it produces /usr/bin/python3: can't open file '/usr/bin/master': [Errno 2] No such file or directory.

-- Best wishes, Leon