ubuntu 14.04 install g++ 问题"g++ : Depends: g++-4.8 (>= 4.8.2-5~) but it is not going to be installe"

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Ubuntu 14.04通过 sudo apt-get install g++ 出现“g++ : Depends: g++-4.8 (>= 4.8.2-5~) but it is not going to be installed”错误，

是因为ubuntu 14.04的源过旧或不可访问导致，可以通过更新源解决。

首先，备份原始源文件source.list

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

其次，依据ubuntu的版本添加新的源

1）lsb_release -a查看ubuntu版本号

比如 No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
Release: 14.04
Codename: trusty

2）依据版本号如14.04 trusty选择新的源文件，并添加到/etc/apt/source.list文件尾部

例如，我参考

http://chenrongya.blog.163.com/blog/static/8747419620143185103297/

和 http://wiki.ubuntu.org.cn/Template:14.04source，

选择Ubuntu 官方更新服务器（欧洲，此为官方源，国内较慢，但无同步延迟问题，电信、移动/铁通、联通等公网用户可以使用)：

deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

并将这些源添加到/etc/apt/source.list文件末尾

3）更新ubuntu 源

sudo apt-get update

虽然这时还能看到部分源的包不能下载，但没关系，系统会自动的从新添加的源下载。

4）这时再次运行sudo apt-get install g++就能正常安装了。