You need to upgrade to the version for the 14.04.2 point release (2:2.99.914-1~exp1ubuntu4.2~trusty1), see https://wiki.ubuntu.com/Kernel/LTSEnablementStack
You need to upgrade to the version for the 14.04.2 point release (2:2.99. 914-1~exp1ubunt u4.2~trusty1) , see https:/ /wiki.ubuntu. com/Kernel/ LTSEnablementSt ack