zulip/docs/development/setup/vagrant-up.md

The first time you run this command it will take some time because Vagrant does the following:

• downloads the base Ubuntu 20.04 virtual machine image (for macOS and Windows) or container (for Linux)
• configures this virtual machine/container for use with Zulip,
• creates a shared directory mapping your clone of the Zulip code inside the virtual machine/container at ~/zulip
• runs the ./tools/provision script inside the virtual machine/container, which downloads all required dependencies, sets up the Python environment for the Zulip development server, and initializes a default test database. We call this process "provisioning", and it is documented in some detail in our dependencies documentation.

You will need an active internet connection during the entire process. (See Specifying a proxy if you need a proxy to access the internet.) vagrant up can fail while provisioning if your Internet connection is unreliable. To retry, you can use vagrant provision (vagrant up will just boot the guest without provisioning after the first time). Other common issues are documented in the Troubleshooting and common errors section. If that doesn't help, please visit #provision help in the Zulip development community server for real-time help.