Ubuntu Arm 更换 APT 源

原先的中科大源非常的不稳定，

在Google上偶然发现了HUAWEI的APT源，

刚好也有ubuntu-ports，于是就测试了一下。

速度很快。

#HUAWEI
deb https://mirrors.huaweicloud.com/repository/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.huaweicloud.com/repository/ubuntu-ports/ bionic-security main restricted universe multiverse
deb https://mirrors.huaweicloud.com/repository/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.huaweicloud.com/repository/ubuntu-ports/ bionic-backports main restricted universe multiverse
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