emacs error: "Symbol's value as variable is void: hostname"

emacs error: "Symbol's value as variable is void: hostname" After I installed emacs this error occurs every time on startup. It prevents me from installing plugins, e.g. auctex via aptitude. I already tried to install a plugin by hand (rails for ruby), but doesn't work.
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Guest [Entry]

"Solved" it by reinstalling Ubuntu. Was less work than expected. (Backupped the home folder, so reinstalling took approximately 4h with making an backup and playing it back.)