/usr/bin/x11vnc:*** Error in `x11vnc': free(): invalid next size (fast): ADDR ***

The Ubuntu Error Tracker has been receiving reports about a problem regarding x11vnc. This problem was most recently seen with package version 0.9.13-2, the problem page at https://errors.ubuntu.com/problem/12a78eb72075d8b9bfff14993c619ced131a7b86 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.