ubuntu下执行sudo apt-get update（ubuntu16.04换源）遇到的问题及解决方法总结

参考链接问题：

1.E: 无法下载 http://ppa.launchpad.net/fcitx-team/nightly/ubuntu/dists/xenial/main/binary-amd64/Packages

2.Problem executing scrips APT：：Update：错误

3.Failed to fetch

4.some indax filed failed to downloads

5. 404 Not Found

解决方法：

1.重新配置DNS

$ sudo vim /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
#这里用的是阿里云的DNS服务器
nameserver 223.5.5.5  
nameserver 223.6.6.6

$ sudo apt-get update

2.sudo apt-get clean

   sudo apt-get update

3.把那些第三方的软件更新全部勾去之后就没问题了

4. sudo gedit  /etc/apt/sources.lis(源中的内容更新了)

deb http://mirrors.aliyun.com/ubuntu/ raring main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ raring-security main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ raring-updates main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ raring-proposed main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ raring-backports main restricted universe multiverse  
deb-src http://mirrors.aliyun.com/ubuntu/ raring main restricted universe multiverse  
deb-src http://mirrors.aliyun.com/ubuntu/ raring-security main restricted universe multiverse  
deb-src http://mirrors.aliyun.com/ubuntu/ raring-updates main restricted universe multiverse  
deb-src http://mirrors.aliyun.com/ubuntu/ raring-proposed main restricted universe multiverse  
deb-src http://mirrors.aliyun.com/ubuntu/ raring-backports main restricted universe multiverse

参考链接

参考链接

参考链接

参考链接