Is Nginx required? And PermissionError: [Errno 13] Permission denied: 'db'.

First of all, thanks to @argosopentech for developing this product.

I followed [the process](https://github.com/argosopentech/LibreTranslate-init) and the video and installed it on a remote Linux (Ubuntu 24.04), but I couldn't use it.

I couldn't access 127.0.0.1:5000. I did set it during the installation process:
`$ curl 127.0.0.1:5000`
> curl: (7) Failed to connect to 127.0.0.1 port 5000 after 0 ms: Couldn't connect to server

I just ran the command again to set my host to 127.0.0.1, and the following error was returned:
`$ ~/LibreTranslate/env/bin/libretranslate --host 127.0.0.1`
> Traceback (most recent call last):
File "/home/libretranslate/LibreTranslate/env/bin/libretranslate", line 8, in
sys.exit(main())
^^^^^^
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/libretranslate/main.py", line 238, in main
app = create_app(args)
^^^^^^^^^^^^^^^^
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/libretranslate/app.py", line 1225, in create_app
Session(app)
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/flask_session/__init__.py", line 54, in __init__
self.init_app(app)
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/flask_session/__init__.py", line 61, in init_app
app.session_interface = self._get_interface(app)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/flask_session/__init__.py", line 90, in _get_interface
session_interface = FileSystemSessionInterface(
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/flask_session/sessions.py", line 322, in __init__
self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/libretranslate/LibreTranslate/env/lib/python3.12/site-packages/cachelib/file.py", line 80, in __init__
os.makedirs(self._path)
File "", line 215, in makedirs
File "", line 225, in makedirs
PermissionError: [Errno 13] Permission denied: 'db'

These commands all return nothing:
`$ netstat -ln | grep 5000`
`$ whereis libretranslate`
`$ whereis gunicorn`

Check the running status:
`$ sudo systemctl status libretranslate`

> ● libretranslate.service - LibreTranslate WSGI with Gunicorn and Nginx
Loaded: loaded (/etc/systemd/system/libretranslate.service; enabled; preset: enabled)
Active: active (running) since Fri 2025-04-25 00:48:58 UTC; 16h ago
Main PID: 21541 (gunicorn)
Tasks: 7 (limit: 9372)
Memory: 647.8M (peak: 796.6M)
CPU: 21.079s
CGroup: /system.slice/libretranslate.service
├─21541 /home/libretranslate/LibreTranslate/env/bin/python /home/libretranslate/LibreTranslate/env/bin/gunicorn --workers 3 --bind unix:libretranslate.sock -m 007 wsgi:app
├─21593 /home/libretranslate/LibreTranslate/env/bin/python /home/libretranslate/LibreTranslate/env/bin/gunicorn --workers 3 --bind unix:libretranslate.sock -m 007 wsgi:app
├─21594 /home/libretranslate/LibreTranslate/env/bin/python /home/libretranslate/LibreTranslate/env/bin/gunicorn --workers 3 --bind unix:libretranslate.sock -m 007 wsgi:app
└─21595 /home/libretranslate/LibreTranslate/env/bin/python /home/libretranslate/LibreTranslate/env/bin/gunicorn --workers 3 --bind unix:libretranslate.sock -m 007 wsgi:app
Apr 25 00:48:58 ip-10-0-1-226 systemd[1]: Started libretranslate.service - LibreTranslate WSGI with Gunicorn and Nginx.
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21541]: [2025-04-25 00:48:59 +0000] [21541] [INFO] Starting gunicorn 23.0.0
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21541]: [2025-04-25 00:48:59 +0000] [21541] [INFO] Listening at: unix:libretranslate.sock (21541)
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21541]: [2025-04-25 00:48:59 +0000] [21541] [INFO] Using worker: sync
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21593]: [2025-04-25 00:48:59 +0000] [21593] [INFO] Booting worker with pid: 21593
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21594]: [2025-04-25 00:48:59 +0000] [21594] [INFO] Booting worker with pid: 21594
Apr 25 00:48:59 ip-10-0-1-226 gunicorn[21595]: [2025-04-25 00:48:59 +0000] [21595] [INFO] Booting worker with pid: 21595

Check the configuration:
`sudo nano /etc/systemd/system/libretranslate.service`

> [Unit]
Description=LibreTranslate WSGI with Gunicorn and Nginx
After=network.target
[Service]
User=libretranslate
Group=www-data
WorkingDirectory=/home/libretranslate/LibreTranslate
Environment="PATH=/home/libretranslate/LibreTranslate/env/bin"
ExecStart=/home/libretranslate/LibreTranslate/env/bin/gunicorn --workers 3 --bind unix:libretranslate.sock -m 007 wsgi:app
EnvironmentFile=/home/libretranslate/LibreTranslate-init/.env
Restart=always
ExecReload=/bin/kill -s HUP $MAINPID
KillMode=mixed
TimeoutStopSec=1
[Install]
WantedBy=multi-user.target

I realized that this doesn't seem to be what I want, because:

1. **My Linux is running Apache instead of Nginx**.
2. **I don't need any GUI, everything should be done programmatically**.

I want to reinstall it through other methods, but considering that more than 10GB of language packs and files have been downloaded, I don't want to delete them and download them again.

Can anyone give me some tips? Thank you.

Start by reading the installation process and the referenced /etc/systemd/system/libretranslate.service and .env files. Reproduce the service and direct libretranslate --host commands, then trace the PermissionError and socket binding shown in the logs. Done means the supported Apache or non-GUI setup and reuse of existing language packs are clearly documented or corrected.

Written by the indexing model from the issue text.