前些日子，使用apt-get install 更新东西，突然发现不能更新了，uneable to reach。。。。。。
，在网上查也没有查到原因，难道是ubuntu软件管理中心出了问题？不过这么大的事情网上不可能一点消息都没有的。
自己思考了一下。
apt-get跟什么有关呢？ubuntu软件管理中心。如果他没有问题的话，（说实话，这种应用程序出差错的机会很少。）
那么在往上一层是什么呢？是ubuntu更新源，难得是源出了问题？
忽然想起前段时间好像是网易还是搜狐来着，他们宣布不再提供ubuntu的更新了，好吧那就尝试一下，修改源。
在网上找到了一个修改更新源的文档和源的网址
Ubuntu 10.04 台湾更新源：
deb http://tw.archive.ubuntu.com/ubuntu/ lucid main universe restricted multiverse
deb http://tw.archive.ubuntu.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://tw.archive.ubuntu.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://tw.archive.ubuntu.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://tw.archive.ubuntu.com/ubuntu/ lucid-backports main multiverse restricted universe
deb-src http://tw.archive.ubuntu.com/ubuntu/ lucid main universe restricted multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://tw.archive.ubuntu.com/ubuntu/ lucid-updates universe main multiverse restricted
deb-src http://tw.archive.ubuntu.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://tw.archive.ubuntu.com/ubuntu/ lucid-backports universe main multiverse restricted
Ubuntu 10.04更新源 -Lucid Lynx-中国源，提供 ArchLinux，Everest，FreeBSD，Fedora，LFS，Magiclinux，Mandriva，OpenOffice，openSUSE，Puppy，Red Hat，Slitaz，Turbolinux，Ubuntu
deb http://mirror.lupaworld.com/Ubuntu/ lucid main universe restricted multiverse
deb-src http://mirror.lupaworld.com/Ubuntu/ lucid main universe restricted multiverse
deb http://mirror.lupaworld.com/Ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirror.lupaworld.com/Ubuntu/ lucid-security universe main multiverse restricted
deb http://mirror.lupaworld.com/Ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirror.lupaworld.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirror.lupaworld.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirror.lupaworld.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirror.lupaworld.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirror.lupaworld.com/Ubuntu/ lucid-updates universe main multiverse restricted
rootguide源，Ubuntu官方上海源，提供 Kernel，Hiweed，ubuntu
deb http://mirror.rootguide.org/Ubuntu/ lucid main universe restricted multiverse
deb-src http://mirror.rootguide.org/Ubuntu/ lucid main universe restricted multiverse
deb http://mirror.rootguide.org/Ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirror.rootguide.org/Ubuntu/ lucid-security universe main multiverse restricted
deb http://mirror.rootguide.org/Ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirror.rootguide.org/Ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirror.rootguide.org/Ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirror.rootguide.org/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirror.rootguide.org/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirror.rootguide.org/Ubuntu/ lucid-updates universe main multiverse restricted
网易开源镜像站,提供 FreeBSD，OpenBSD，archlinux，centos，cygwin，debian，Fedora，gentoo，kernel，openSUSE，slackware，Ubuntu
deb http://mirrors.163.com/Ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.163.com/Ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.163.com/Ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.163.com/Ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.163.com/Ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.163.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.163.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/Ubuntu/ lucid-updates universe main multiverse restricted
搜狐开源镜像站，提供 CPAN，FreeBSD，NetBSD，OpenBSD，apache，archlinux，centos，cygwin，dag，debian，Fedora，gentoo，kernel，lfs，mysql，nginx，openSUSE，php，rpmfusion，slackware，Ubuntu
deb http://mirrors.shlug.org/Ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.shlug.org/Ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.shlug.org/Ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.shlug.org/Ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.shlug.org/Ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.shlug.org/Ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.shlug.org/Ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.shlug.org/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.shlug.org/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.shlug.org/Ubuntu/ lucid-updates universe main multiverse restricted
搜狐开源镜像站，提供 CPAN，FreeBSD，NetBSD，OpenBSD，apache，archlinux，centos，cygwin，dag，debian，Fedora，gentoo，kernel，lfs，mysql，nginx，openSUSE，php，rpmfusion，slackware，Ubuntu
deb http://mirrors.sohu.com/Ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.sohu.com/Ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.sohu.com/Ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.sohu.com/Ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.sohu.com/Ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.sohu.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.sohu.com/Ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.sohu.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.sohu.com/Ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.sohu.com/Ubuntu/ lucid-updates universe main multiverse restricted
网易开源镜像站, 提供 FreeBSD，OpenBSD，archlinux，centos，cygwin，debian，Fedora，gentoo，kernel，openSUSE，slackware，Ubuntu
deb http://Ubuntu.cn99.com/ubuntu/ lucid main universe restricted multiverse
deb-src http://Ubuntu.cn99.com/ubuntu/ lucid main universe restricted multiverse
deb http://Ubuntu.cn99.com/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://Ubuntu.cn99.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://Ubuntu.cn99.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://Ubuntu.cn99.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://Ubuntu.cn99.com/ubuntu/ lucid-updates universe main multiverse restricted
骨头源（骨头源是bones7456架设的一个Ubuntu源），提供 Ubuntu,deepin
deb http://Ubuntu.srt.cn/ubuntu/ lucid main universe restricted multiverse
deb-src http://Ubuntu.srt.cn/ubuntu/ lucid main universe restricted multiverse
deb http://Ubuntu.srt.cn/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://Ubuntu.srt.cn/ubuntu/ lucid-security universe main multiverse restricted
deb http://Ubuntu.srt.cn/ubuntu/ lucid-updates universe main multiverse restricted
deb http://Ubuntu.srt.cn/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://Ubuntu.srt.cn/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://Ubuntu.srt.cn/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://Ubuntu.srt.cn/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://Ubuntu.srt.cn/ubuntu/ lucid-updates universe main multiverse restricted
修 改更新源设置： # sudo gedit /etc/apt/sources.list
然后粘贴上述网址到该文件中
#sudo apt-get upgrade
后来发现果然原来的有些源更新不了 ，
这次告诉我遇到问题要自己想方法，跟什么有关，尽力去尝试，你就可以解决，因为网上所有关于各种问题的解决方法都是跟我们一样的人
发现的。