Make sure to follow the instructions provided online https://docs.openstack.org/developer/...

1) Create non-root user:

sudo adduser stack // stack being the name of that user

2) Make user stack a sudoer:

sudo tee <<<"stack ALL=(ALL) NOPASSWD: ALL" /etc/sudoers

3) And of course swtich to that user:

sudo su - stack

Also, if you're trying this for the first time, try to install DevStack without a local.conf file which means:

1) Download DevStack and go to the devstack directory:

git clone https://git.openstack.org/openstack-d...

cd devstack

2) Run the script: ./stack.sh

Hope this helps

You can install it from scratch. You can also post details about your failure here and add your local.conf file. Finally, if it doesn't have to be Ubuntu, use Centos and try Packstack.