Asks the user whether they want to install the latest RC or stable, then downloads the correct kernel and installs it.

Ubuntu Kernel Upgrader Script

#!/bin/bash
cd /tmp

if ! which lynx > /dev/null; then sudo apt-get install lynx -y; fi

if [ "$(getconf LONG_BIT)" == "64" ]; then arch=amd64; else arch=i386; fi

function download() {
   wget $(lynx -dump -listonly -dont-wrap-pre $kernelURL | grep "$1" | grep "$2" | grep "$arch" | cut -d ' ' -f 4)
}

# Kernel URL
read -p "Do you want the latest RC?" rc
case "$rc" in
   y* | Y*) kernelURL=$(lynx -dump -nonumbers http://kernel.ubuntu.com/~kernel-ppa/mainline/ | tail -1) ;;
   n* | N*) kernelURL=$(lynx -dump -nonumbers http://kernel.ubuntu.com/~kernel-ppa/mainline/ | grep -v rc | tail -1) ;;
   *) exit ;;
esac
 
read -p "Do you want the lowlatency kernel?" lowlatency
case "$lowlatency" in
   y* | Y*) lowlatency=1 ;;
   n* | n*) lowlatency=0 ;;
   *) exit ;;
esac

# Download Kernel
if [ "$lowlatency" == "0" ]; then
   echo "Downloading the latest generic kernel."
   download generic header
   download generic image
elif [ "$lowlatency" == "1" ]; then
   echo "Downloading the latest lowlatency kernel."
   download lowlatency header
   download lowlatency image
fi

# Shared Kernel Header
wget $(lynx -dump -listonly -dont-wrap-pre $kernelURL | grep all | cut -d ' ' -f 4)

# Install Kernel
echo "Installing Linux Kernel"
sudo dpkg -i linux*.deb
echo "Done. You may now reboot."

a quick fix is to add grep v[1-9].[1-9].[1-9] in the lynx dump command

edit: before the tail -n1

@alothings @ronnocnave

See at http://kernel.ubuntu.com/~kernel-ppa/mainline/ the page render 4.7.x folder after v4.7.10 folder.

He problem is how the script detect the last valid folder

The solution provided by @nicman23 not looks valid, will ignore folders like 4.13 or 4.13.1

Also http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=A not works for me