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root@chenluancl-desktop:~# apt-get install mplayer
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
mplayer: Depends: libasound2 (> 1.0.14) but 1.0.13-1ubuntu5 is to be installed
Depends: libc6 (>= 2.6-1) but 2.5-0ubuntu14 is to be installed
Depends: libdbus-1-3 (>= 1.1.1) but 1.0.2-1ubuntu4 is to be installed
Depends: libdbus-glib-1-2 (>= 0.74) but 0.73-1 is to be installed
Depends: libfreetype6 (>= 2.3.5) but 2.2.1-5ubuntu1.1 is to be installed
Depends: libgcc1 (>= 1:4.2.1) but 1:4.1.2-0ubuntu4 is to be installed
Depends: libglib2.0-0 (>= 2.14.0) but 2.12.11-0ubuntu1 is to be installed
Depends: libgtk2.0-0 (>= 2.12.0) but 2.10.11-0ubuntu3 is to be installed
Depends: liblame0 (>= 3.97) but it is not going to be installed
Depends: libncurses5 (>= 5.6) but 5.5-5ubuntu2 is to be installed
Depends: libpango1.0-0 (>= 1.18.2) but 1.16.2-0ubuntu1 is to be installed
Depends: libstdc++6 (>= 4.2.1) but 4.1.2-0ubuntu4 is to be installed
Depends: libx264-54 but it is not installable
Depends: libxdamage1 (>= 1:1.1) but 1:1.0.3-3 is to be installed
Depends: zlib1g (>= 1:1.2.3.3.dfsg-1) but 1:1.2.3-13ubuntu4 is to be installed
E: Broken packages

换源试试

我不知道...按wiki的...

你用了feisty的源了吧

将源了的feisty 全改为gutsy

在
sudo apt-get update
sudo apt-get install mplayer

gutsy源在那找啊..我是菜鸟啊..