Comment 81 for bug 150193

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Kip Warner (kip) wrote : Re: Remote Login via XDMCP is not working in Ubuntu Gusty/7.10

I think he has the wrong thread too. Here is what you want to do. Let us assume the patch gdm-2.20.1-svnfixes.patch has been downloaded into the current directory.

apt-get source gdm (this gets the source code to gdm and unpacks in current dir)
sudo apt-get build-dep gdm (this gets anything else needed to compile the above package)
cd gdm-2.20.0
patch -p1 < ../gdm-2.20.1-svnfixes.patch
dpkg-buildpackage -rfakeroot -uc -b
cd ../

You should now have the newly compiled gdm package in the directory where you started. Install as you normally would. Note that the patch is for 2.20.1, but the source in the repo appears to be for 2.20.0. The patch applies without worry, but I have not tested xdmcp since I don't have another machine available to connect to right now.

Kip