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configure
set system package repository wheezy components 'main contrib non-free'
set system package repository wheezy distribution wheezy 
set system package repository wheezy url http://http.us./debian
set system package repository wheezy-security components main
set system package repository wheezy-security distribution wheezy/updates
set system package repository wheezy-security url http://security.
commit
save
exit
apt-get update
apt-cache search mtr 
traceroutemtr-tiny

如果直接修改sources.list文件，重啟后會(huì)沒有。