Pihole overrides hostname without being instructed to do so

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Am not sure if thats recommended.
That would mean that if processes on the own host try to lookup their own name debianserver, they wont be able to connect without resorting to external DNS records.
And some use that line to configure the FQDN for the own host:

pi@ph5b:~ $ man hostname
[..]
   THE FQDN
       The FQDN (Fully Qualified Domain Name) of the system  is  the  name
       that the resolver(3) returns for the host name, such as, ursula.ex‐
       ample.com.  It is usually the hostname followed by the  DNS  domain
       name  (the part after the first dot).  You can check the FQDN using
       hostname --fqdn or the domain name using dnsdomainname.

       You cannot change the FQDN with hostname or dnsdomainname.

       The recommended method of setting the FQDN is to make the  hostname
       be  an alias for the fully qualified name using /etc/hosts, DNS, or
       NIS. For example, if the hostname was "ursula", one  might  have  a
       line in /etc/hosts which reads

              127.0.1.1    ursula.example.com ursula

Better to just instruct embedded dnsmasq to not read the hosts file with below directive:

pi@ph5b:~ $ man dnsmasq
[..]
       -h, --no-hosts
              Don't read the hostnames in /etc/hosts.

EDIT: I have this one disabled enabled anyway bc we have local DNS records now :wink:

pi@ph5a:~ $ cat /etc/dnsmasq.d/99-no-hosts.conf
no-hosts

EDIT2: Ow and you most likely break sudo: