Article 6KGRZ should I follow these instructions for this error? Failed to fetch security undetermined error IP: 91.189.91.38 80

should I follow these instructions for this error? Failed to fetch security undetermined error IP: 91.189.91.38 80

by
linux-man
from LinuxQuestions.org on (#6KGRZ)
Should I follow the same instructions here on this link even though I am on pop os vm? I have the same error message.

It's a fresh install of pop os vm.

error message is
Quote:
Failed to fetch security undetermined error [IP: 91.189.91.38 80]


Code:W: Ignoring file 'opera.lis' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: http://us.archive.ubuntu.com/ubuntu impish/main amd64 libftdi1-2 amd64 1.5-5build1 is not (yet) available (404 Not Found [IP: 91.189.91.39 80])
E: http://us.archive.ubuntu.com/ubuntu impish/main amd64 libllvm11 amd64 1:11.0.1-2ubuntu5 is not (yet) available (404 Not Found [IP: 91.189.91.39 80])
E: http://us.archive.ubuntu.com/ubuntu impish/universe amd64 libclang-cpp11 amd64 1:11.0.1-2ubuntu5 is not (yet) available (404 Not Found [IP: 91.189.91.39 80])
E: http://us.archive.ubuntu.com/ubuntu impish/main amd64 python3-netaddr all 0.8.0-1 is not (yet) available (404 Not Found [IP: 91.189.91.39 80])
E: http://us.archive.ubuntu.com/ubuntu impish/multiverse amd64 firmware-sof-signed all 1.7-1 is not (yet) available (404 Not Found [IP: 91.189.91.39 80])
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