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When I try to update or upgrade my Ubuntu 11.10 installation through either update manager or the terminal I get a connection error. How can I troubleshoot this?

Err us.archive.ubuntu.com/ubuntu oneiric-updates/main firefox amd64 12.0+build1-0ubuntu0.11.10.1 Connection failed [IP: 91.189.92.155 80] 
Err security.ubuntu.com/ubuntu oneiric-security/main firefox amd64 12.0+build1-0ubuntu0.11.10.1 Connection failed [IP: 91.189.92.151 80] 
Failed to fetch security.ubuntu.com/ubuntu/pool/main/f/firefox/… Connection failed [IP:91.189.92.151 80] 
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing
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Please can you post the wording of the error? Also post output of this command typed into a treminal. dpkg -l |grep dpkg – Sun Dial May 9 '12 at 14:42
    
ii dpkg 1.16.0.3ubuntu5.1 Debian package management system – kwesi May 9 '12 at 16:05
    
Err us.archive.ubuntu.com/ubuntu oneiric-updates/main firefox amd64 12.0+build1-0ubuntu0.11.10.1 Connection failed [IP: 91.189.92.155 80] Err security.ubuntu.com/ubuntu oneiric-security/main firefox amd64 12.0+build1-0ubuntu0.11.10.1 Connection failed [IP: 91.189.92.151 80] Failed to fetch security.ubuntu.com/ubuntu/pool/main/f/firefox/… Connection failed [IP: 91.189.92.151 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? – kwesi May 9 '12 at 16:06
    
Are you connecting to the Internet through a proxy? – Sun Dial May 9 '12 at 16:14
    
Well am using a mobile usb modem. However, i have been using this all the while and have been able to update my ubuntu until recently. Could that be the issue? – kwesi May 9 '12 at 16:27
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If you are able to reach remote server on the internet using IP address, but not by domain name, then most likely you need to update your DNS servers:

  1. Edit /etc/resolv.conf:

    sudo vi /etc/resolv.conf

  2. If any nameserver lines appear, write down the IP addresses for future reference. Replace the nameserver lines with, or add, the following lines:

    For IPv4:

    nameserver 8.8.8.8
nameserver 8.8.4.4

    For IPv6:

    nameserver 2001:4860:4860::8888
nameserver 2001:4860:4860::8844

  3. Save and exit.

  4. Restart any Internet clients you are using.

  5. Test that your setup is working correctly:

    ping google.com

Reference: Google Public DNS

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Dont know what happened, i tried again this morning without going through the proposed solution but its working. Updating through the terminal though – kwesi May 10 '12 at 9:22

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