Comment 10 for bug 192218

This bug has been fixed in subversion revision 1550 and affects 64bit only, which presumably means that KeenEars is seeing a different bug.

http://rdesktop.svn.sourceforge.net/viewvc/rdesktop?view=revision&revision=1550

I have attached the relevant patch.

In order to fix this on a temporary basis for yourself:

apt-src install rdesktop
cp ~/Downloads/ewmhints.c.patch rdesktop-1.6.0 # or wherever you downloaded the patch to
cd rdesktop-1.6.0
patch -p2 < ewmhints.c.patch
apt-src build rdesktop

then you can install the resulting .deb file with dpkg -i.