Hello Sir Gulu
Please open a terminal and type (or copy-paste), one at time, the followings 
lines:

cd  /etc/apt

sudo mv sources.list sources.list.old

Then open the attached sources.list file and copy it, back to terminal
type:

sudo gedit

and paste into the opened window the copied file.
Click on Save icon and type as name   sources.list
close gedit and run again update-manager


** Attachment added: "sources.list"
   
https://bugs.launchpad.net/ubuntu/+bug/665438/+attachment/1736435/+files/sources.list

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https://bugs.launchpad.net/bugs/665438
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