How to solve DNS problems in 12.04?

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http://askubuntu.com – I use sudo pppoeconf method to connect to Internet. This works fine with 11.10 and older versions but not with 12.04 derivatives like Linux Mint-Maya, Pinguy OS, Zorin 6.0 etc. Please help me I am worried as 12.04 is LTS. This is the message I get in Google chrome browser: This web page is not available. The server at encrypted.google.com can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can als (HowTos)