I get this error when trying to install Peertube:
$ cd …/ && sudo -u peertube ln -s versions/peertube-${VERSION} ./peertube-latest
[sudo] password for main:
ln: failed to create symbolic link ‹ ./peertube-latest ›: Permission denied
$
What are the outputs of ls -l /var/www/peertube and ls -l /var/www? Also there is a typo in your command, it’s cd ../ and not cd .../