NEW 404 error solution to fix:
I copied my sources.list and changed server to main sever from software & update and ran sudo apt-get update then I restore my original sources.list and then again I ran sudo apt-get update then stil the error not fix. then I run these three commands I think (these are last 3 commands from my bash_histroy) then I run update again and 404 error gone and fixed my problem :)