To reproduce:

1. Open installation guide: https://secure.phabricator.com/book/phabricator/article/installation_guide/
2. Try to get to script page Ubuntu: install_ubuntu.sh https://secure.phabricator.com/diffusion/P/browse/master/scripts/install/install_ubuntu.sh

Actual result:
Unhandled Exception ("ConduitClientException")
ERR-CONDUIT-CORE: Command failed with error #128!
COMMAND
'/usr/bin/sudo' -E -n -u 'ubuntu' -- git fetch --prune -- 'ssh://172.30.0.64:22/diffusion/P/' '+refs/*:refs/*'

STDOUT
(empty)

STDERR
Warning: Permanently added '172.30.0.64' (RSA) to the list of known hosts.
phabricator-ssh-exec: Your account ("device/secure.phacility.net") does not have permission to establish SSH sessions. Visit the web interface for more information.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.