今天ubuntu9.10 alpha4 升级出现了点问题：
Preparing to replace language-pack-zh 1:9.10 (using .../language-pack-zh_1%3a9.10+20090805_all.deb) ...
Unpacking replacement language-pack-zh ...
Preparing to replace language-pack-zh-base 1:9.10 (using .../language-pack-zh-base_1%3a9.10+20090805_all.deb) ...
Unpacking replacement language-pack-zh-base ...
dpkg: error processing /var/cache/apt/archives/language-pack-zh-base_1%3a9.10+20090805_all.deb (--unpack):
trying to overwrite `/usr/share/locale-langpack/zh_TW/LC_MESSAGES/sed.mo', which is also in package language-pack-zh-hant-base
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Preparing to replace language-pack-gnome-zh 1:9.10 (using .../language-pack-gnome-zh_1%3a9.10+20090805_all.deb) ...
Unpacking replacement language-pack-gnome-zh ...
Preparing to replace language-pack-gnome-zh-base 1:9.10 (using .../language-pack-gnome-zh-base_1%3a9.10+20090805_all.deb) ...
Unpacking replacement language-pack-gnome-zh-base ...
dpkg: error processing /var/cache/apt/archives/language-pack-gnome-zh-base_1%3a9.10+20090805_all.deb (--unpack):
trying to overwrite `/usr/share/locale-langpack/zh_TW/LC_MESSAGES/gnome-settings-daemon.mo', which is also in package language-pack-gnome-zh-hant-base
中文的显示是这样：
(正在读取数据库 ... 系统当前总共安装有 123909 个文件和目录。)
正在解压缩 language-pack-gnome-zh-hans-base (从 .../language-pack-gnome-zh-hans-base_1%3a9.10+20090819_all.deb) ...
dpkg：处理 /var/cache/apt/archives/language-pack-gnome-zh-hans-base_1%3a9.10+20090819_all.deb (--unpack)时出错：
正试图覆盖“/usr/share/locale-langpack/zh_CN/LC_MESSAGES/gnome-settings-daemon.mo”，它属于软件包 language-pack-gnome-zh-base
dpkg-deb: 子进程 粘贴 被信号(Broken pipe)终止了
正在解压缩 language-pack-gnome-zh-hant-base (从 .../language-pack-gnome-zh-hant-base_1%3a9.10+20090819_all.deb) ...
dpkg：处理 /var/cache/apt/archives/language-pack-gnome-zh-hant-base_1%3a9.10+20090819_all.deb (--unpack)时出错：
正试图覆盖“/usr/share/locale-langpack/zh_TW/LC_MESSAGES/gnome-settings-daemon.mo”，它属于软件包 language-pack-gnome-zh-base
dpkg-deb: 子进程 粘贴 被信号(Broken pipe)终止了
在处理时有错误发生：
/var/cache/apt/archives/language-pack-gnome-zh-hans-base_1%3a9.10+20090819_all.deb
/var/cache/apt/archives/language-pack-gnome-zh-hant-base_1%3a9.10+20090819_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
类似这样的错误：
dpkg: error processing /var/cache/apt/archives/AAA (–unpack):
trying to overwrite `/usr/lib/BBB‘, which is also in package CCC
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
AAA
E: Sub-process /usr/bin/dpkg returned an error code (1)
解决方法：
sudo dpkg -i --force-overwrite AAA
(give full path of AAA), and then run
sudo apt-get -f install
again.