By xuyuan8
I get error when apt-get update how to resolve this problem?
Err:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Could not resolve 'security.ubuntu.com'
Err:2 http://mirrors.digitalocean.com/ubuntu xenial InRelease
Could not resolve 'mirrors.digitalocean.com'
Err:3 http://mirrors.digitalocean.com/ubuntu xenial-updates InRelease
Could not resolve 'mirrors.digitalocean.com'
Err:4 http://mirrors.digitalocean.com/ubuntu xenial-backports InRelease
Could not resolve 'mirrors.digitalocean.com'
Reading package lists... Done
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/xenial/InRelease Could not resolve 'mirrors.digitalocean.com'
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/xenial-updates/InRelease Could not resolve 'mirrors.digitalocean.com'
W: Failed to fetch http://mirrors.digitalocean.com/ubuntu/dists/xenial-backports/InRelease Could not resolve 'mirrors.digitalocean.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Could not resolve 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
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If you run into this issue remember to check, amongst other things, that you have not configured UFW or the DO Cloud Firewall to block outgoing http/https. I had done this accidentally and only realized it when I tried to do apt-get install for something
Correct nameserver in /etc/resolv.conf and ping works for security.ubuntu.com and 8.8.8.8 - However still struggling with
W: The repository 'http://mirrors.digitalocean.com/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
on sudo apt-get update
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