El servicio systemd uwsgi no se ejecuta automáticamente pero se ejecuta cuando se inicia desde una sesión interactiva

El servicio systemd uwsgi no se ejecuta automáticamente pero se ejecuta cuando se inicia desde una sesión interactiva

Habilité el servicio uWSGI en systemd pero no se ejecuta al inicio, el registro muestra lo siguiente:

Wed Nov 22 12:36:10 2017 - your processes number limit is 47903
Wed Nov 22 12:36:10 2017 - your memory page size is 4096 bytes
Wed Nov 22 12:36:10 2017 - detected max file descriptor number: 1024
Wed Nov 22 12:36:10 2017 - lock engine: pthread robust mutexes
Wed Nov 22 12:36:10 2017 - thunder lock: disabled (you can enable it with --thunder-lock)
Wed Nov 22 12:36:10 2017 - uwsgi socket 0 bound to UNIX address /run/uwsgi/app/myapp/socket fd 3
Wed Nov 22 12:36:10 2017 - Python version: 2.7.12 (default, Nov 19 2016, 06:48:10)  [GCC 5.4.0 20160609]
Wed Nov 22 12:36:10 2017 - Set PythonHome to /home/me/venv
ImportError: No module named site

Sin embargo, cuando ejecuto sudo systemctl restart uwsgiel servicio comienza como se esperaba:

Wed Nov 22 13:31:07 2017 - setuid() to 1000
Wed Nov 22 13:31:07 2017 - your processes number limit is 47903
Wed Nov 22 13:31:07 2017 - your memory page size is 4096 bytes
Wed Nov 22 13:31:07 2017 - detected max file descriptor number: 1024
Wed Nov 22 13:31:07 2017 - lock engine: pthread robust mutexes
Wed Nov 22 13:31:07 2017 - thunder lock: disabled (you can enable it with --thunder-lock)
Wed Nov 22 13:31:07 2017 - uwsgi socket 0 bound to UNIX address /run/uwsgi/app/myapp/socket fd 3
Wed Nov 22 13:31:07 2017 - Python version: 2.7.12 (default, Nov 19 2016, 06:48:10)  [GCC 5.4.0 20160609]
Wed Nov 22 13:31:07 2017 - Set PythonHome to /home/me/venv
Wed Nov 22 13:31:07 2017 - *** Python threads support is disabled. You can enable it with --enable-threads ***
Wed Nov 22 13:31:07 2017 - Python main interpreter initialized at 0xec83c0
Wed Nov 22 13:31:07 2017 - your server socket listen backlog is limited to 100 connections
Wed Nov 22 13:31:07 2017 - your mercy for graceful operations on workers is 60 seconds
Wed Nov 22 13:31:07 2017 - mapped 218304 bytes (213 KB) for 2 cores
Wed Nov 22 13:31:07 2017 - *** Operational MODE: preforking ***
Wed Nov 22 13:31:09 2017 - WSGI app 0 (mountpoint='') ready in 2 seconds on interpreter 0xec83c0 pid: 2744 (default app)
Wed Nov 22 13:31:09 2017 - *** uWSGI is running in multiple interpreter mode ***
Wed Nov 22 13:31:09 2017 - spawned uWSGI master process (pid: 2744)
Wed Nov 22 13:31:09 2017 - spawned uWSGI worker 1 (pid: 2760, cores: 1)
Wed Nov 22 13:31:09 2017 - spawned uWSGI worker 2 (pid: 2761, cores: 1)

¿Cual podría ser el problema?

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