I recently installed pihole on the same Raspberry Pi 3 as I was running a GitLab CE installation. They set up competing web servers, and rather than try to deconfilct them, I decided to uninstall pihole and put it onto a Raspberry Pi 2 that I had taking up space. Pihole is running fine on that computer, but when it uninstalled from the Pi running gitlab, it lost all ability to resolve hostnames and is having other networking issues.
While pihole was uninstalling, the script had a message that it was going to remove packages that were installed during setup and that it was now safe to uninstall. I didn't think much about it until it wanted to uninstall git and I realized that perhaps it wasn't safe to let it continue through its list.
I can ping 8.8.8.8 and 8.8.4.4, but I can't ping google. I can access the GitLab web page using http://gitpi.local, but I can't push or pull to it. More importantly, I can't run apt-get.
Can anyone help identify what might pihole have uninstalled or changed on my Pi during the uninstall that would have caused this behavior?