I am try to install xserver-xorg-lts-quantal in ubuntu 12.04 .
But it says installing xserver-xorg-lts-quantal will remove many packages.
How to keep those packages?
Thanks

When I choose xserver-xorg-lts-quantal in synaptic, it gives :

When I run in terminal , it gives :

$ sudo apt-get install xserver-xorg-lts-quantal

[sudo] password for xxxxxx: 

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 : Depends: libglapi-mesa (= 9.0.1-0ubuntu1~precise)

                   Recommends: libgl1-mesa-dri (>= 7.2)

 xserver-xorg-lts-quantal : Recommends: libgl1-mesa-dri-lts-quantal but it is not going to be installed

                            Recommends: libgl1-mesa-glx-lts-quantal but it is not going to be installed

                            Recommends: xserver-xorg-video-all-lts-quantal but it is not going to be installed

                            Conflicts: libgl1-mesa-glx (>= 0~)

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.