Do not go to a 3.15 or later Ubuntu kernel at this time if your are using krbd. See bug 8818. The Ubuntu 3.14.x kernels seems to work fine with krbd on Trusty. >The mainline packages from Ubuntu should be helpful in testing. > > Info: https://wiki.ubuntu.com/Kernel/MainlineBuilds > Packages: http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D >> Now to figure out the best way to get a 3.14 kernel in Ubuntu Trusty :)