我无法升级 Ubuntu 14.04 或安装任何新软件，因为我总是收到以下错误：
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libc6-dev : Depends: linux-libc-dev but it is not going to be installed
libnss3 : Breaks: libnss3:i386 (!= 2:3.19.2-1ubuntu1) but 2:3.26.2-0ubuntu0.14.04.3 is to be installed
libnss3:i386 : Breaks: libnss3 (!= 2:3.26.2-0ubuntu0.14.04.3) but 2:3.19.2-1ubuntu1 is to be installed
libnss3-nssdb : Depends: libnss3 (= 2:3.26.2-0ubuntu0.14.04.3) but 2:3.19.2-1ubuntu1 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
我尝试跑步
sudo apt-get -f install
但它不起作用，因为我在输出中收到以下错误：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
account-plugin-windows-live kde-l10n-ar kde-l10n-engb libntdb1 libupstart1
linux-headers-3.16.0-30 linux-headers-3.16.0-30-generic
linux-image-3.16.0-30-generic linux-image-extra-3.16.0-30-generic
python-ntdb python-pexpect python-renderpm python-reportlab
python-reportlab-accel
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libnss3
The following packages will be upgraded:
libnss3
1 upgraded, 0 newly installed, 0 to remove and 146 not upgraded.
3 not fully installed or removed.
Need to get 1,126 kB of archives.
After this operation, 30.7 kB disk space will be freed.
Do you want to continue? [Y/n] Y
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libnss3 amd64 2:3.26.2-0ubuntu0.14.04.3 [1,126 kB]
Fetched 1,126 kB in 5s (214 kB/s)
(Reading database ... 292354 files and directories currently installed.)
Preparing to unpack .../libnss3_2%3a3.26.2-0ubuntu0.14.04.3_amd64.deb ...
Unpacking libnss3:amd64 (2:3.26.2-0ubuntu0.14.04.3) over (2:3.19.2-1ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/libnss3_2%3a3.26.2-0ubuntu0.14.04.3_amd64.deb (--unpack):
trying to overwrite shared '/usr/share/doc/libnss3/changelog.Debian.gz', which is different from other instances of package libnss3:amd64
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/libnss3_2%3a3.26.2-0ubuntu0.14.04.3_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
编辑：顶部状态栏中时钟旁边出现一个错误图标，其中包含文本
发生错误，请从右键菜单运行包管理器或在终端中运行 apt-get 来查看错误所在。错误消息为：“错误：Brokencount > 0”。这通常意味着您安装的包有未满足的依赖关系。
点击显示更新在这个图标菜单中我得到了窗口（新的重要安全和硬件支持更新。
警告：您当前硬件启用堆栈的安全更新已于 2016-08-04 结束http://wiki.ubuntu.com/1404_HWE_EOL
通过尝试单击此窗口上的“安装”，它仍然会显示安装错误。
我该如何修复我的系统以便能够升级？
答案1
错误消息中解释了该问题：
dpkg: error processing archive /var/cache/apt/archives/libnss3_2%3a3.26.2-0ubuntu0.14.04.3_amd64.deb (--unpack):
trying to overwrite shared '/usr/share/doc/libnss3/changelog.Debian.gz', which is different from other instances of package libnss3:amd64
这是一个罕见的错误，并且可能有多种原因。如果此错误频繁出现，则不要反复修复它 - 您必须调查和修复更深层次的问题。
怎么修：由于您可能没有使用更改日志文件，请尝试重命名它。如果安装成功，您可以安全地删除它。
sudo mv /usr/share/doc/libnss3/changelog.Debian.gz /usr/share/doc/libnss3/changelog.Debian.gz.bak
sudo apt-get upgrade
sudo apt-get -f install
sudo rm /usr/share/doc/libnss3/changelog.Debian.gz.bak
如果您在此过程中遇到任何错误消息，停止。