Re: How to install MPLAB X on Ubuntu?
canberra is a linux module for dealing with sounds coming from events in a program. There's a known problem with it that produces this message. (Actually, the problem is with the programs, not with canberra.)
I've seen the following recommended:
1. sudo apt-get install libcanberra-gtk3-module
2. sudo apt-get purge libcanberra-gtk-module
--- but personally I've always just ignored the message.