uninstall leaves ubuntu 18.04 host system without workable dns resolver

[increddibelly]

I've had some intermittent internet connectivity which I've pinpointed to my DNS resolver. My PiHole is running on an old Atom D525 system (running ubuntu 18.04), which I suspect is simply not strong enough to do all the things I tell it to do.

I wanted to try un- and reinstall the pi-Hole addon for troubleshooting. Uninstall took the addon away neatly and removed the docker container, but now I have a nasty bunch of networking problems on my hassio host.

• install button of pihole (and other addons) turns red after a few seconds; this boils down to being unable to resolve Github.com.
• ubuntu thinks it's offline: it can't resolve DNS queries.
• I can no longer change network settings for my ethernet / wifi adapters; the settings screen simply does not come up. I wish I'd be able to read some logs for this, it might be a big clue as to what's happening.
• desperately changing DNS servers in all the dnsmasq / resolved.conf / netplan files and following every guide available on the internet does not resolve anything. (excuse the horrid puns).

steps to reproduce:

• give hassio box static ip
• set hassio box dns to 127.0.0.1 and 8.8.8.8 (*)
• install pi-hole addon from hassio add on store.
• enjoy ad free life.
• uninstall pi-hole addon from hassio add on page.
• hassio box can no longer resolve dns queries

(*) (removing 127.0.0.1 does nothing, surprisingly / unfortunately)

QFT: Originally posted by @vermi5 in https://github.com/hassio-addons/addon-pi-hole/issues/35#issuecomment-416322228 What I can't fathom is the incredible mess of a host system I must have so that if I try to uninstall the addon, Ubuntu cannot resolve URLs anymore (the homeassistant container still can resolve but If I press Install or update buttons on the frontend they do nothing) so I can't use the reinstall workaround.

[addons-assistant[bot]]

:wave: Thanks for opening your first issue here! If you're reporting a :bug: bug, please make sure you include steps to reproduce it. Also, logs, error messages and information about your hardware might be usefull.

[increddibelly]

I will post Network Manager logs when I get home and if I can find them. should journalctl -u NetworkManager do that trick?

[sinclairpaul]

The documentation for the addon states that you need to give your host operating system a static IP and static external DNS server. This isn't an issue with the addon so I am closing. I would suggest to jump on Discord if you need some assistance resolving your system issues.

[addons-assistant[bot]]

This thread has been automatically locked because it has not had recent activity. Please open a new issue for related bugs and link to relevant comments in this thread.