修改 ubuntu 更新源 - 如果出现 ?E: 无法定位软件包

原文：http://blog.csdn.net/msmile_my/article/details/52172962

E: 无法定位软件包 libgles2-mesa-dev

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

deb .aliyun.com/ubuntu/ xenial main restricted universe multiverse deb .aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb .aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb .aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse ##测试版源 deb .aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse # 源码 deb-src .aliyun.com/ubuntu/ xenial main restricted universe multiverse deb-src .aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb-src .aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb-src .aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse ##测试版源 deb-src .aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse # Canonical 合作伙伴和附加 deb .canonical.com/ubuntu/ xenial partner deb .ubuntu.com/ubuntu/ xenial main


然后用  sudo apt-get update 命令更新一下软件源。