Adding /usr/sbin to your $PATH is probasbly a good idea
If it isn't already.  To check just type
echo $PATH
at a command prompt.  The last Ayufan Buster image I grabbed doesn't have it.  dpkg-reconfigure is there but not in your path so it doesn't work.  You could run it as /usr/sbin/dpkg-reconfigure except it also calls itself which won't work that way.

I just used it to set locales, it does a couple things as well like keyboard layouts, time zones.  To see what you're missing by not having it in your path do
ls /usr/sbin
Most of the binaries in /usr/sbin are for root, and using sudo <command> should get those paths included

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