From Blue-IT.org Wiki

Attempt to unlock mutex that was not locked


Ubuntu Trusty (14.04)


GTK-2 apps crash with the error: "Attempt to unlock mutex that was not locked". The problem occurs when using ppa's that use error phrone gtk-2 libs (like atareao's pushbullet ppa).


My solution:

I identified one PPA, that seams so give me wrong gtk-packages. For you, there might be other ppa that reflect the libgtk2 related packages

sudo ppa-purge ppa:atareao/atareao
sudo ppa-purge inizan-yannik/mono

Then reinstall the trusty-versions of the libgtk2 packages:

sudo apt-get install libgtk2.0 libgtk2.0-dev/trusty libglib2.0-dev/trusty libglib2.0-bin/trusty \ 
libpango1.0-dev/trusty libpango-1.0-0/trusty libpangocairo-1.0-0/trusty libpangoft2-1.0-0/trusty \
libpangoxft-1.0-0/trusty gir1.2-pango-1.0/trusty libgtk2.0-cil/trusty libpango1.0-0/trusty

If some packages where removes, simly reinstall them, e.g.

sudo apt-get install acroread wine1.7 monodevelop ...