Public bug report changed: https://launchpad.net/malone/bugs/34417 Comment: Which version of mono-classlib-1.0 do you have installed? Try reinstalling mono-classlib-1.0 (apt-get --reinstall install mono-classlib-1.0). Do you have the directory /usr/lib/mono/gac/ICSharpCode.SharpZipLib/0.84.0.0__1b03e6acf1164f73 ?