由 dawei
1.备份原来的源文件
cd/etc/apt cpsources.listsources.list.00
2.将源文件清空后更新为网易的源
visources.list debhttp://mirrors.163.com/ubuntu/trustymainrestricteduniversemultiverse debhttp://mirrors.163.com/ubuntu/trusty-securitymainrestricteduniversemultiverse debhttp://mirrors.163.com/ubuntu/trusty-updatesmainrestricteduniversemultiverse debhttp://mirrors.163.com/ubuntu/trusty-proposedmainrestricteduniversemultiverse debhttp://mirrors.163.com/ubuntu/trusty-backportsmainrestricteduniversemultiverse deb-srchttp://mirrors.163.com/ubuntu/trustymainrestricteduniversemultiverse deb-srchttp://mirrors.163.com/ubuntu/trusty-securitymainrestricteduniversemultiverse deb-srchttp://mirrors.163.com/ubuntu/trusty-updatesmainrestricteduniversemultiverse deb-srchttp://mirrors.163.com/ubuntu/trusty-proposedmainrestricteduniversemultiverse deb-srchttp://mirrors.163.com/ubuntu/trusty-backportsmainrestricteduniversemultiverse
3.更新系统
apt-getupdate apt-getupgrade
最后附上阿里云的源：
debhttp://mirrors.aliyun.com/ubuntu/trustymainrestricteduniversemultiverse debhttp://mirrors.aliyun.com/ubuntu/trusty-securitymainrestricteduniversemultiverse debhttp://mirrors.aliyun.com/ubuntu/trusty-updatesmainrestricteduniversemultiverse debhttp://mirrors.aliyun.com/ubuntu/trusty-proposedmainrestricteduniversemultiverse debhttp://mirrors.aliyun.com/ubuntu/trusty-backportsmainrestricteduniversemultiverse deb-srchttp://mirrors.aliyun.com/ubuntu/trustymainrestricteduniversemultiverse deb-srchttp://mirrors.aliyun.com/ubuntu/trusty-securitymainrestricteduniversemultiverse deb-srchttp://mirrors.aliyun.com/ubuntu/trusty-updatesmainrestricteduniversemultiverse deb-srchttp://mirrors.aliyun.com/ubuntu/trusty-proposedmainrestricteduniversemultiverse deb-srchttp://mirrors.aliyun.com/ubuntu/trusty-backportsmainrestricteduniversemultiverse