In file ​http://winswitch.org/dists/lenny/main/binary-i386/Packages, as well as in Packages for other Debian/Ubuntu? versions, xpra is mentioned as a dependency for winswitch, but its description is missing in the mentioned Packages. The package correctly resides in ​http://winswitch.org/dists/lenny/main/binary-i386/xpra-0.0.7.16.i386.deb and after downloading and installing with

dpkg --install xpra-0.0.7.16.i386.deb

the installation of winswitch from the repository succeedes.

There is a file conflict between netifaces and python-netifaces packages in the winswitch repo for Fedora 20:

file /usr/lib64/python2.7/site-packages/netifaces.so from install of python-netifaces-0.10.4-1.fc20.x86_64 conflicts with file from package netifaces-0.10.4-1.fc20.x86_64

Both of netifaces-0.10.4-1.fc20.x86_64 and python-netifaces-0.10.4-1.fc20.x86_64 are in the winswitch repo, conflicting with each other.

It looks like the xpra package used to depend on netifaces but it depends on python-netifaces now, but python-netifaces is not coinstallable with netifaces.

My guess would be that the python-netifaces is missing Obsoletes: netifaces.