ubuntu的源_ubuntu哪个源比较好

# deb http://cn.archive.ubuntu.com/ubuntu/ artful main restricted # deb http://cn.archive.ubuntu.com/ubuntu/ artful-updates main restricted # deb http://security.ubuntu.com/ubuntu artful-security main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://cn.archive.ubuntu.com/ubuntu/ artful main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ artful-updates main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://cn.archive.ubuntu.com/ubuntu/ artful universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful universe deb http://cn.archive.ubuntu.com/ubuntu/ artful-updates universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu  ## team, and may not be under a free licence. Please satisfy yourself as to  ## your rights to use the software. Also, please note that software in  ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://cn.archive.ubuntu.com/ubuntu/ artful multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful multiverse deb http://cn.archive.ubuntu.com/ubuntu/ artful-updates multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful-updates multiverse ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://cn.archive.ubuntu.com/ubuntu/ artful-backports main restricted universe multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ artful-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu artful partner # deb-src http://archive.canonical.com/ubuntu artful partner deb http://security.ubuntu.com/ubuntu artful-security main restricted # deb-src http://security.ubuntu.com/ubuntu artful-security main restricted deb http://security.ubuntu.com/ubuntu artful-security universe # deb-src http://security.ubuntu.com/ubuntu artful-security universe deb http://security.ubuntu.com/ubuntu artful-security multiverse # deb-src http://security.ubuntu.com/ubuntu artful-security multiverse