I Have upgraded from 12.04 to 12.10 and upgrade went smoothly, but after the restart I was not able to access the Internet and unable to ping any Domain like google.com, though i was able to access my wireless router.

After investigating i found out that /etc/resolv.conf contains Loopback address( I updated this file with google public DNS address ( and tried to restart Network Manager and then my system got struck eventually I have to reboot it.After Rebooting I was able to access internet , but problem doesn't get over yet now when ever I switch the network DNS Network doesn't get change with network( i am on DHCP) , which i need to change manually every time.

I understand that the loop back address was correct /etc/resolv.conf as Network manger should handle the DNS Server but unfortunately it didn't work out for me.


the answer above is cool but all the other devices on my network no longer have dns after my 12.10 connects to the 5g ie 801.11n part of the router. i have to reset the router for all of the devices to get dns again. so 12.10 will make windows 8 users flock to ubuntu? with this issue, it should work, not ask people to do several workaround or only connect to 802.11g side of router only.


Most likely the symbolic link /etc/resolv.conf -> ../run/resolvconf/resolv.conf is missing on your system. To restore it, do the following in a terminal.

sudo apt-get install resolvconf
sudo dpkg-reconfigure resolvconf

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