E Unable to fetch some archives, maybe run apt get update or try with fix missing

This video how to fix E: Failed to fetch http://security.ubuntu.com/ubuntu/poo...  404  Not Found [IP: 91.189.91.38 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/poo...  404  Not Found [IP: 91.189.91.38 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/poo...  404  Not Found [IP: 91.189.91.38 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/poo...  404  Not Found [IP: 91.189.91.38 80]
#E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

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