I get error when apt-get update how to resolve this problem?

March 20, 2018 6.6k views
Linux Basics Linux Commands Ubuntu 16.04
jorgecossa
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jorgecossa

Err http://security.ubuntu.com trusty-security InRelease

Err http://security.ubuntu.com trusty-security Release.gpg
Could not resolve 'security.ubuntu.com'
Err http://mz.archive.ubuntu.com trusty InRelease

Err http://mz.archive.ubuntu.com trusty-updates InRelease

Err http://mz.archive.ubuntu.com trusty-backports InRelease

Err http://mz.archive.ubuntu.com trusty Release.gpg
Could not resolve 'mz.archive.ubuntu.com'
Err http://mz.archive.ubuntu.com trusty-updates Release.gpg
Could not resolve 'mz.archive.ubuntu.com'
Err http://mz.archive.ubuntu.com trusty-backports Release.gpg
Could not resolve 'mz.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty/InRelease

W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease

W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty-backports/InRelease

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/InRelease

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg Could not resolve 'security.ubuntu.com'

W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg Could not resolve 'mz.archive.ubuntu.com'

W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg Could not resolve 'mz.archive.ubuntu.com'

W: Failed to fetch http://mz.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg Could not resolve 'mz.archive.ubuntu.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.

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1 Answer
kamaln7 MOD March 20, 2018

It looks like your Droplet is having trouble looking up domain names, possibly because the DNS resolvers are misconfigured. Can you post the output of these two commands?

cat /etc/resolv.conf
sudo netstat -plutn | grep :53
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  • jorgecossa March 21, 2018

    cat /etc/resolv.conf
    root@ubuntu:/home/jorge# cat /etc/resolv.conf

    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

    DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

    nameserver 8.8.8.8

    netstat -plutn | grep :53
    root@ubuntu:/home/jorge# netstat -plutn | grep :53
    tcp 0 0 192.168.109.140:53 0.0.0.0:* LISTEN 1190/named
    tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 1190/named
    tcp6 0 0 :::53 :::* LISTEN 1190/named
    udp 0 0 192.168.109.140:53 0.0.0.0:* 1190/named
    udp 0 0 127.0.0.1:53 0.0.0.0:* 1190/named
    udp6 0 0 :::53 :::* 1190/named

    • kamaln7 MOD March 26, 2018

      Hmm, that looks fine. Your server should be using the name servers configured in /etc/resolv.conf. I found this post that is a bit old but I doubt that much has changed since then. Does that help?

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