I was attempting to upgrade from 14.04 to 16.04, but do-release-upgrade threw this error:
0% [Connecting to mirrors.digitalocean.com (104.21.29.13)]
Err Upgrade tool signature Connection failed [IP: 104.21.29.13 80] 0% [Connecting to mirrors.digitalocean.com (172.67.148.71)] 0% [Connecting to mirrors.digitalocean.com (172.67.148.71)]
Err Upgrade tool Connection failed [IP: 104.21.29.13 80] Fetched 0 B in 6s (0 B/s) WARNING:root:file ‘xenial.tar.gz.gpg’ missing
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Heya @dadwg,
It seems like you were unable to connect to the mirror - mirrors.digitalocean.com.
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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