Added common troubleshooting step

README.md

@@ -118,6 +118,7 @@ Note that existing task results will not be available after the change. Refer to
 Sympthoms | Possible Solutions
 --------- | ------------------
 While starting WebODM you get: `from six.moves import _thread as thread ImportError: cannot import name _thread` | Try running: `sudo pip install --ignore-installed six`
+While starting WebODM you get: `could not translate host name “db” to address: Name or service not known` | Try restarting your computer, then type: `./webodm.sh down && ./webodm.sh start`
 Task output or console shows one of the following:<ul><li>`MemoryError`</li><li>`Killed`</li></ul> |  Make sure that your Docker environment has enough RAM allocated: [MacOS Instructions](http://stackoverflow.com/a/39720010), [Windows Instructions](https://docs.docker.com/docker-for-windows/#advanced)
 After an update, you get: `django.contrib.auth.models.DoesNotExist: Permission matching query does not exist.` | Try to remove your WebODM folder and start from a fresh git clone
 Task fails with `Process exited with code null`, no task console output | If the computer running node-opendronemap is using an old or 32bit CPU, you need to compile [OpenDroneMap](https://github.com/OpenDroneMap/OpenDroneMap) from sources and setup node-opendronemap natively. You cannot use docker. Docker images work with CPUs with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3 instruction set support or higher.