apt-get unable to resolve

Posted May 30, 2014 5.7k views
Trying to install iptables-persistent with apt-get. It stucks with resolving resulting in "Temporary failure resolving" this hostname. I checked resolv.conf - it has & nameservers Also apt/sources.list has 5 deb entries with Infact I can't even ping those nameservers along with other domains I've tried. Iptables set to output accept policy with no rules.

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Submit an Answer
3 answers
You need to change repository link from and to
Does it work if you temporarily reset your IPTables rules?
Run the following commands to take a backup of your rules and then reset everything to the defaults:
sudo iptables-save | sudo tee iptables.backup

sudo iptables -F
sudo iptables -X

Then, check if the apt-get command works.
You can restore your rules by running this command:
sudo iptables-restore < iptables.backup
@hungbc2811: You would only need to use if you were on an unsupported version of Ubuntu. If that is the case, I'd highly advise you to upgrade to a current release so that you still receive security support. "old-releases" just allows you to access the existing packages, you won't get any update or security fixes.