As the title say! I already started the install of Debian 8.7.1 three times and always get the same error: while checking the Hostname I get: In Hosts I defined: The setting are written as used before in the setup. Once I also was try to use 127.0.0.1 localhost.localdomain localhost, just was getting the same error that hostname is invalid! How I could solve that problem? Thanks for info and help.