After installation and adding domain I get this error. sudo: unable to resolve host : ssdnodes-5ff846853a5cb Name or service not known

After installation and adding domain I get this error. sudo: unable to resolve host : ssdnodes-5ff846853a5cb Name or service not known

I have added the host name in the etc/hosts/
but still not resolved.

Any help?

probaly wrong hostname, maybe check v-change-sys-hostname host.domain.tld

I usualy take web01.domain.tld, depends on what you want to use.