"You must put some 'source' URIs in your sources.list"

[Miao Yu]

Hi:


When I try to build the libreoffice, I keep getting the notice "You must put some 'source' URIs in your sources.list" after I input "sudo apt-get build-dep libreoffice". I have tried every methods I can find online to fix it, but none works. 


My sources.list is 



###### Ubuntu Main Repos
deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse 
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse 


###### Ubuntu Update Repos
deb http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse 
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse 
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse 
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse 


Could you help me out? Thank you very much!


William7777

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