出现的问题:

在这里插入图片描述
一个最简单的办法:
直接换源:可以换我推荐的源,阿里云的这个源

步骤:
1.

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

2.把sources.list的内容全部删掉,把以下的内容复制进去

sudo vim /etc/apt/sources.list #修改

deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
sudo apt-get update #更新列表

应该没什么问题了,如果问题再次出现,换其他的源,如清华,网易等等的源。

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