Public bug report changed: https://launchpad.net/malone/bugs/34417 Comment: I have mono-classlib-1.0 version 1.1.8.3-1ubuntu2. The reinstall makes no change. The only file under /usr/lib/mono/gac/ICSharpCode.SharpZipLib/ is 0.6.0.0__1b03e6acf1164f73/ICSharpCode.SharpZipLib.dll.