Help : to install V13

Dear My Helpers,
I tried to install ERP Next V13 but always have errors
please see the steps and edit on it please to complete my installation.

1- sudo apt-get update && sudo apt-get upgrade
2- echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
3- shutdown -r now
4- sudo apt-get install python-minimal
5- wget
6-python --develop --user frappe
7- export LC_ALL=C.UTF-8
8- ython --develop --user frappe
9- sudo su - frappe -s /bin/bash
10-cd frappe-bench
11- bench new-site your_sitename
12- bench --site your_sitename install-app erpnext
13- bench use your_sitename
14-bench start

All of above scripts on Ubuntu 18.04
Please I need Help which step i will change to be on V13
Note: Iam just start up in installation