You'll have to edit your /etc/hosts file to reflect a different domain.
Hope it helps!
But ugh, that's a lot of stuff to study, when the problem may be rather trivial.
How about try reinstalling all avahi packages. (Using a package manager, check anything with *avahi* in their names.)
I recommend to move to Debian 'testing' anyway (i.e. upgrade) except your laptop is way old. I bet the upgrade fixes the error message.
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