解决方法：
请etc/resolvconf/resolv.conf.d这个目录下，添加一个文件，文件填写你相对应的网络的DNS的配置，如电信的网络，则添加nameserve 202.96.134.133
这里我添加的文件名字叫tail,在该文件添加以下内容：
root@galen:/etc/resolvconf/resolv.conf.d# cat tail nameserver 202.96.134.133 nameserver 202.96.128.68
使用：wq!保存一下。
最后你尝试进行 apt-get update（根用户下），会出现以下现象：
Hit http://security.ubuntu.com precise-security/universe Sources Hit http://security.ubuntu.com precise-security/multiverse Sources Hit http://security.ubuntu.com precise-security/main i386 Packages Hit http://security.ubuntu.com precise-security/restricted i386 Packages Hit http://security.ubuntu.com precise-security/universe i386 Packages Hit http://security.ubuntu.com precise-security/multiverse i386 Packages Hit http://security.ubuntu.com precise-security/main TranslationIndex Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex Hit http://security.ubuntu.com precise-security/restricted TranslationIndex Hit http://extras.ubuntu.com precise/main Sources Hit http://security.ubuntu.com precise-security/universe TranslationIndex Hit http://security.ubuntu.com precise-security/main Translation-en Hit http://security.ubuntu.com precise-security/multiverse Translation-en Hit http://extras.ubuntu.com precise/main i386 Packages Ign http://extras.ubuntu.com precise/main TranslationIndex Hit http://security.ubuntu.com precise-security/restricted Translation-en Hit http://security.ubuntu.com precise-security/universe Translation-en Ign http://extras.ubuntu.com precise/main Translation-en_US Ign http://extras.ubuntu.com precise/main Translation-en Fetched 72 B in 7s (9 B/s) Reading package lists... Done root@galen:~#
到了这步，恭喜你，DNS的配置重启丢失问题已解决了。
注意：你不能在直接进行以下的操作：
root@galen:~# vi /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 202.96.134.133 nameserver 202.96.128.68
这样重启后就会清空该文件的内容了。
