Linux Kernel 4.0 in its stable release has been made available for download today for Ubuntu users. As usual, we will see in this tutorial how to upgrade to this new kernel using a simple bash script as shown below.

Here are some features in this new release:

Live Patching (update the kernel package without rebooting)
Intel Quark SoC x86 platform support
Full IBM z13 support
DisplayPort audio

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Source:upubuntu