@Jenkler Okay thanks. I didn't know what to do since it says "ONLY Debian 7" and I'm kind of new to all this. So I just followed the documenation until the "clone this repository" step (which did not work, because there is no such directory ("or file"). Here the errors from the other steps:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "de_DE.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("de_DE.UTF-8").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
dpkg: error processing package redis-server (--configure):
subprocess installed post-installation script returned error exit status 1
Processing triggers for libc-bin (2.19-18+deb8u4) ...
Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.31.1-2+deb8u5) ...
Processing triggers for systemd (215-17+deb8u4) ...
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
-bash: cd: /path/to/nodebb/install/location: file or directory not found
I hope someone can help me here. Thank you very much! I'd love to run nodebb!