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Update installation.markdown (#9613)

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* Update installation.markdown

* ✏️ Tweaks
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warcanoid 2019-06-20 19:29:07 +02:00 committed by Franck Nijhof
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source/_docs/z-wave/installation.markdown
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@ -227,6 +227,18 @@ $ ls /dev/cu.usbmodem*
If your device path changes when you restart, see [this guide](http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/) on fixing it.
## {% linkable_title Ubuntu and Debian based host system %}
If your instance is running on a Debian based system, e.g., Ubuntu, the ModemManager may cause unexpected issues.
The ModemManager might be claiming or interfering with a USB Z-Wave stick, like the much used Aeotec ones. If you experience issues where the stick stops responding, needs to be re-plugged or Home Assistant needs a restart to get Z-Wave back, chances are high that the ModemManager is causing the issue.
Execute the following command on your host system to disable the ModemManager:
```bash
systemctl disable ModemManager.service
```
### {% linkable_title Component could not be set up %}
Sometimes the device may not be accessible and you'll get an error message upon startup about not being able to set up Z-Wave. Run the following command for your device path (here we're using `/dev/ttyAMA0` for our Razberry board):