Arch Linux: Re-install current kernel version from local cache

# It happens every so often on Arch Linux, that the kernel is updated and you have to reboot in order
# to being able to load the new kernel modules. This can lead to a situation where you are not able
# to mount filesystems, start docker, etc. because the old running kernel can not load the new modules.

# If you want to defer the reboot and still want to load some kernel modules, you can re-install the
# old kernel like this:

sudo pacman -U /var/cache/pacman/pkg/linux*-$(uname -r | grep -o "^.*-[0-9][0-9]*")-x86_64.pkg.tar.xz