I recently upgraded to koala, but gimp no longer functioned after upgrade; i.e. open file popup dialogue freezes, crop tool is non-functional, preferences dialogue was absolutely a blank box. Tried un-install/re-install thru both the new software center and synaptic. Same broken result every time. Tried a direct download from gimp.org but ran into a lot of dependency stuff I know nothing about; I'm an end user, not a coder. So, how do I get a functioning install of gimp?