Scripted version of a reddit post detailing installing a more recent kernel

ubuntu-latest-kernel

#!/bin/bash
# Scripted version of this reddit post:
# https://www.reddit.com/r/linuxmint/comments/dawx7s/how_i_fixed_my_ubuntu_base_to_get_the_best/
# Beerware Licence and standard no warranty, no liability disclaimers

# TO-DO: Perhaps insert a reboot after the kernel installation

# Define any extra packages that we want
extra_packages=(
  amd64-microcode
  fancontrol
  fwupd
  fwupdate
  i2c-tools
  intel-microcode
  lm-sensors
  libsensors4-dev
  mrtgutils-sensors 
  read-edid
  thermald
)

# Function to list available kernels
get_available_kernels() {
  apt-cache search linux-image-[0-9].*generic | sort -nr | awk '{print $1}'
}

# This function formats our output
# Options:
# -e prints a non-fatal error to stderr and returns 1 from the function
# -l prints a long line with the provided text e.g. --[ provided text here----(dashes continue)
# -x prints a fatal error to stderr and exits
# * Any text provided without an arg is treated as an informational output
send_user() {
  case "${1}" in
    (-a)  printf -- '\e[32m--[ ATTENTION ]-- %s\e[0m\n' "${*:2}" ;;
    (-e)  printf -- '\e[31m--[ ERROR ]-- %s\e[0m\n' "${*:2}" >&2; return 1 ;;
    (-l)
      shift
      local lnlen="${COLUMNS:-$(tput cols)}"
      local msg="${*}"
      local msglen="${#msg}"
      lnlen=$(( lnlen - (msglen + 6) ))
      printf -- '\e[32m--[ %s ]%s\e[0m\n' "${msg}" "$(printf '%*s' "${lnlen}" '' | tr ' ' -)"
    ;;
    (-x)  printf -- '\e[31m--[ ERROR ]-- %s\e[0m\n' "${*:2}" >&2; exit 1 ;;
    (*)   printf -- '\e[32m--[ INFO ]-- %s\e[0m\n' "${*}" ;;
  esac
}

# Ensure that we're running with root privileges
(( UID != 0 )) && send_user -x "This script must be run as root"

# Ensure that we're on an Ubuntu or a derivative like Mint
uname -a | grep -q Ubuntu || \
  send_user -x "This script is for Ubuntu, Mint and other Ubuntu derivatives"

# Send a greeting message
send_user -l Welcome
printf -- '%s\n' "This script reconfigures Ubuntu, Mint etc for a more recent kernel" \
  "This adds hardware support, various fixes and improvements"

# Install this PPA and update.
# This PPA is canonical STABLE dont be scared by the wording.
# Its post Ubuntu Mainline.
# In 6 years Ive never had an issue. ever. 
# Its how FOSS works. gems hiding in plain site.
send_user -l "Ensuring kernel PPA is configured"
add-apt-repository --yes ppa:canonical-kernel-team/proposed

send_user -l "Ensuring oibaf graphics drivers PPA is configured"
add-apt-repository --yes ppa:oibaf/graphics-drivers

send_user -l "Grabbing latest list of updates"
apt-get update

send_user -l "Performing full-upgrade"
apt-get --yes dist-upgrade

send_user -l "Cleaning up and fixing packages where necessary"
apt-get install --yes --fix-broken
apt-get install --yes --fix-missing
apt-get --yes autoclean
apt-get --yes autoremove

# Get a list of kernels and build an array
readarray -t avail_kernels < <(get_available_kernels)

# Offer the user a choice of available kernels
send_user -a "Please select a kernel version from the following list"

select target_kernel in "${avail_kernels[@]}"; do
  send_user "${target_kernel} selected"
  break
done

# Extract our version information from the selection
target_version=$(cut -d '-' -f3- <<< "${target_kernel}")

# We should only need the following packages to get all our required deps
send_user -l "Installing target kernel: ${target_kernel}"
apt-get install --yes \
  linux-headers-"${target_version}" \
  linux-modules-extra-"${target_version}" \
  linux-headers-"${target_version/generic/lowlatency}" \
  linux-modules-"${target_version/generic/lowlatency}"

send_user -l "Installing extra packages"
apt-get install --yes --reinstall --install-recommends "${extra_packages[@]}"

send_user -l "Running firmware check and update"
systemctl start fwupd
fwupdmgr refresh
fwupdmgr update

send_user -l "Performing cursory grub update"
update-grub
update-initramfs -c -k all

send_user -l "Script complete!"
printf '%s\n' "Everything should now be ready.  Reboot and enjoy!"