Ubuntu package downgrade

I tried to use some Karmic sources for my Intrepid. Of course, this is bad. The reason I had to do it was the package of new version I needed only exist in Karmic repository.
After installing a package, suddenly I got the following error when I tried to use gvim
"gvim: error while loading shared library: libgailutil.so.18: cannot open shared object file: No such file or directory"

Obviously, the old libgail18 was removed which is needed by Intrepid. Because I used unmatched sources, the apt-get did not detect any problem.

I tried to install libgail18 using command
    sudo apt-get install libgail18
It did not work and the error message is

Package libgail18 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libgtk2.0-0
E: Package libgail18 has no installation candidate

Finally, I figured out the cause is package libgtk2.0-0, libgtk2.0-0-common, etc. These packages are too new for Intrepid. They are for Karmic. So I tried to remove these packages using command
    sudo apt-get remove libgtk2.0-0 libgtk2.0-0-common etc
However, apt-get always gave error messages which told me those packages were needed by lots of other packages. It is obviously true. Also I tried command
    sudo apt-get install --reinstall libgtk2.0-0
It also did not work. The error message is the package cannot be found. Again the cause I think was the those installed packages were too new and did not match version of ubuntu.

It turned out that I need to use dpkg command
    dpkg --remove –-depends libgtk2.0-0 libgtk2.0-0-common etc

Then use following command to fix the broken dependencies:
    sudo apt-get install –f
libgtk2.0-0, libgtk2.0-0-common of correct versions are downloaded and installed.

Probably following commands are needed to clean up:
    sudo dpkg --configure –a
    dpkg-reconfigure

One big difficult I encountered was it was hard to collect detailed log about which files are created/updated/removed by which package during installation. It makes much easier to locate those packages which remove needed files.