Perform the following steps on each server participating in the Contrail Fabric after running fab upgrade_kernel_all: 1. Open the /etc/default/grub file and do the following change: GRUB_DEFAULT=0 to GRUB_DEFAULT='Advanced options for Ubuntu>Ubuntu, with Linux 3.13.0-40-generic’ 2. Enter the following: root@test:~# update-grub root@test:~# reboot 3. Once the servers are back up and running, you can use the uname -a command to check the kernel version that the operating system has booted from. Proceed with the other Contrail installation steps.