[ubuntu] Internet Connection Issue . [ Immediate Help ]

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http://ubuntuforums.org – I installed Ubuntu 12.04 way long back back . But i used it for only two weeks . My major problems is connecting to internet . Problem Description : I am using Reliance Broadband Wire-line Connection .To connect to internet i need to enter Username and password and then i have to connect to internet . But when i use it Ubuntu , i am able to connect internet but i loose connection every 5 min . I need to connect and disconnect several times using network icon on right top corner . My connection Details : [ from my windows 7 machine ] Connection-specific DNS Suffix: reliancebroadband.co.in Des (Hardware)