Installing YunoHost manually

Once you have Debian 9 (with kernel >= 3.12) and access to a command line on your server (either directly or through SSH), you can install yunohost by running command as root :

curl | bash

(If curl is not installed on your system, you might need to install it with apt install curl. Otherwise, if the command does not do anything, you might want to apt install ca-certificates)

Once the installation is finished, you may want to proceed to post-installation

Note for advanced users concerned with the curl|bash approach

If you strongly object to the curl|bash way (and similar commands) of installing software, consider reading "Is curl|bash insecure?" on Sandstom's blog, and possibly this discussion on Hacker News.