sysytem error

[gajanan2]

hey i m new to ubuntu 14.4,it is fantastic.but i hav a system error, the error messegewas:"unknown error:'<class'system error'>'(e:type'cdrom:(ubuntu#debtu14.04LTS_Trusty tahr_-Release i 386(20140722.2)3)/'is not know on line 1 in sourselist/etc/apt/source.list. what to do further.:mad::mad:

[oldos2er]

Please don't create duplicate threads. Closed.