Не удалось установить devstack

$ sudo apt-get install git 
[sudo] password for shrihari:  
Reading package lists... 
Done Building dependency tree        
Reading state information... 
Done git is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.

Далее я пытаюсь установить devstack, но некоторая сетевая ошибка после выполнения следующего:

$ git clone https://git.openstack.org/openstack-dev/devstack
Cloning into 'devstack'...
fatal: unable to access 'https://git.openstack.org/openstack-dev/devstack/': Failed to connect to git.openstack.org port 443: Network is unreachable