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The manual installation document is missing a step. Specifically, there is one additional thing you need to for Debian/Ubuntu systems. You can locate the missing step by going through the individual steps or by carefully inspecting and understanding what each step is responsible for. For reference, here is the relevant part of the documentation: https://zulip.readthedocs.io/en/latest/dev-setup-non-vagrant.html#on-debian-or-ubuntu-systems.

For a hint, refer to this discussion on Zulip: https://chat.zulip.org/#narrow/stream/installation.20help/topic/virtualenv

This task entails locating and adding the missing step, testing that the instructions work correctly after fixing the omission and creating a pull request for updating the documentation.