无法在14.04.03中安装Steam（依赖关系问题？）[已更新]（这也应有助于解决15.04中的问题）

刚拿到我的新电脑并安装了14.04.03。

安装过程中没有错误。

带有道具的Nvidia显卡。驱动程序（尝试过Geforce GTS 970- 346和352版本的驱动程序）

安装steam-launcher并单击以安装Steam后，将弹出一个终端窗口，其中包含以下内容

Steam needs to install these additional packages: 
libgl1-mesa-dri:i386, libgl1-mesa-glx:i386, libc6:i386

输入密码后，我得到以下信息”

    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.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgl1-mesa-glx:i386 : Depends: libglapi-mesa:i386 (= 10.1.3-0ubuntu0.4)
 unity-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed
                        Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
Press return to continue: 

我可以找到的与同一问题相同的唯一问题是，安装受接受的答案的Steam的依赖问题sudo apt-get -s install libgl1-mesa-glx-lts-utopic:i386，然后在测试成功的情况下运行它。我的考试给了我

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.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 gnome-session-bin : Depends: libgl1-mesa-glx or
                              libgl1
 libcheese-gtk23 : Depends: libcheese7 (>= 3.4.0) but it is not going to be installed
                   Depends: libclutter-1.0-0 (>= 1.13.2) but it is not going to be installed
                   Depends: libclutter-gtk-1.0-0 (>= 0.91.8) but it is not going to be installed
                   Depends: libcogl15 (>= 1.15.8) but it is not going to be installed
 libgl1-mesa-glx-lts-utopic:i386 : Depends: libglapi-mesa-lts-utopic:i386 (= 10.3.2-0ubuntu1~trusty2) but it is not going to be installed
                                   Depends: libgl1-mesa-dri-lts-utopic:i386 (= 10.3.2-0ubuntu1~trusty2) but it is not going to be installed
 libgnome-desktop-3-7 : Depends: libgl1-mesa-glx or
                                 libgl1
 libqt5gui5 : Depends: libgl1-mesa-glx or
                       libgl1
 libqt5multimedia5-plugins : Depends: libqgsttools-p1 (>= 5.2.1-0ubuntu5) but it is not going to be installed
 libqt5quick5 : Depends: libgl1-mesa-glx or
                         libgl1
 libwebkitgtk-3.0-0 : Depends: libgl1-mesa-glx or
                               libgl1
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

我正在使用新的图形驱动程序ppa https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa，所以可能是由这些库引起的？

如果不是有人知道如何解决此问题，那么我升级计算机的全部原因是为了在游戏中获得更好的性能，因此这真是耳光......

编辑：删除ppa无效。似乎问题出在libgl1-mesa-dri:i386如果您尝试安装它时，apt-get出现unity-control-center上面的错误。Synaptic甚至都找不到它们，如果您尝试使用Software Center，则会收到警告：

更新＃2 Steam现在将启动，但仍会弹出要安装上述三个库的终端窗口。如果您关闭窗口，Steam将启动并似乎正常工作。到目前为止，我能够恢复自己的游戏并推出了一款游戏。

认罪不认为这已解决。我不希望每次启动时都被窗口打扰，我想知道突然起作用的可能发生的事情，我不记得安装任何库，只是尝试手动安装上面的那些库。如果我必须重新安装，我需要知道如何修复它，其他方法是反复尝试安装，拉出我的头发，将头从桌子上砸下来然后重复……