failed to upgrade ubuntu "Err Upgrade tool signature"

I was attempting to upgrade from 14.04 to 16.04, but do-release-upgrade threw this error: 0% [Connecting to (]

Err Upgrade tool signature Connection failed [IP: 80] 0% [Connecting to (] 0% [Connecting to (]

Err Upgrade tool Connection failed [IP: 80] Fetched 0 B in 6s (0 B/s) WARNING:root:file ‘xenial.tar.gz.gpg’ missing

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December 16, 2023

Heya @dadwg,

It seems like you were unable to connect to the mirror -

Are you by any chance using a Firewall that is filtering connections on port 80? This seems like an issue with exactly that.

When you do apt update do you get the same error?

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