The error message is "Failed to move to new namespace: PID namespaces supported. Network namespace supported, but failed: errno = Operation not permitted"

Solutions

Just choose one of the solutions below.

For Docker

Add --cap-add SYS_ADMIN for docker run to gain the permission

For example: 

$ docker run -it \  
             --cap-add=SYS_ADMIN \  
             -e PYTHONPATH=$(container_work_dir)  
             -p $(site_port_mapping)  
             -p $(admin_port_mapping)  
             -p $(https_port_mapping)  
             -w $(container_work_dir)  
             --name $(project_name)`

For Selenium

Add --no-sandbox while launching Chrome driver

For example: 

from selenium import webdriver  

chrome_options = webdriver.ChromeOptions()  
chrome_options.add_argument('--no-sandbox')  
chrome = webdriver.Chrome(chrome_options=chrome_options)

References

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