Error 404 on execution of $sudo bash setup_frappe.sh

Hi I am not able to install erp Next in my digital ocean droplet

following error is displayed

http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/ecometrica/servers/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Seems like a network issue. Retry!

@Pratik_Sharma

Why are you using setup_frappe.sh script to setup your bench? Please use following guide

# Linux:

wget https://raw.githubusercontent.com/frappe/bench/master/playbooks/install.py

# Mac OSX:

# install X Code (from App store)
# install HomeBrew (http://brew.sh/)
brew install python
brew install git
curl "https://raw.githubusercontent.com/frappe/bench/master/playbooks/install.py" -o install.py

# For development
sudo python install.py --develop

# For production
sudo python install.py --production

# If you are logged in as root, use "--user" flag to create a user and install using that user
'sudo python install.py --develop --user frappe'