In order to test Pi-hole, I installed this with the script that has to be downloaded.
After testing for some time, I removed Pi-hole with the same script, using the uninstall option.
This must have caused my DNS to be damaged.
In order to try and solve this I installed or reinstalled dnsutils, ifupdown, iproute2, resolvconf.
But this did not repair my DNS.
I found that this can be solved by editing /etc/resolvconf/resolv.conf.d/tail and adding some working nameservers.
After that I ran
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sudo resolvconf -u
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fred44nl@Debian:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1
nameserver 1.1.1.1
nameserver 192.168.1.1
which means that DNS is looking on my loacalhost, which does not have a DNS server running.
so, where did it go wrong ??