Mir schrieb der Support folgendes:
Actually seems like having the library installed is no use if the game cannot find it. Sorry for the inconvenience. Here is a slightly hacky workaround you could try to do:
This guide is for the Humble Bundle installer.
Download the deb package from de2-0/download and open it with the archive manager. Within the package navigate to usr/lib/i386-linux-gnu and extract libglade-2.0.so.0.0.7 to the same directory as the installer is located at.
If you have the 32bit library installed then you can skip the download part and copy the systems glade library to the installer's directory instead (or setting LD_LIBRARY_PATH directly to that directory where the library is). When the library is in the right place, rename it to "libglade-2.0.so.0" and open terminal in that same directory. In terminal type:
After this it should work. If after installation the game gives an error about the same library on launch it can be copied to lib64 directory in the game's install directory.
Let me know if you have any questions about the instructions above or just how it goes!
Lass mich wissen ob es klappt. ☺ Die Bibliothek habe ich angehängt.