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I don't know if this is still up to date but i had a pretty similiar problem.
I didn't have any host-names in my host file but I added the host-name of the raspberry pi. The only difference was that i wrote the same host-name on my desktop as it is in the hosts file on the raspberry. So your hosts file on Desktop should look like this:
user@desktop:$ cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 desktop
192.168.100.1 pi-desktop