I just want my Ubuntu 18.04 LTS version to have a latest Linux Kernel everytime it gets new release like ArchLinux has. I looked for the answers in google but had really hard time figuring out so I thought I'd ask here and get a quick easy answer. I'm not looking forward to use Ubuntu 19.04 or any latest version instead would love to have Linux 5.0.** on my Ubuntu 18.04.
That's not how Ubuntu is set up; Ubuntu does not follow the strategy Arch uses.
The idea is to upgrade your system to 19.04 is you want newer versions of software/a kernel. If you want a newer kernel in 18.04 you will need to update your system yourself. 18.04 will get the 19.04 kernel somewhere later this year when the next point release arrives (18.04.02).
There is a tool called Ubuntu kernel update (UKUU) that makes this rather easy though:
sudo apt-add-repository ppa:teejee2008/ppa sudo apt update sudo apt install ukuu
After starting ukuu you will get a list of available kernels and you can add the one you want to the system. As the old ones are still there you can then always pick an older one from grub if the newest is not to your liking.
Issue with this... it is not free...
A personal license for Ukuu is currently available for $12. This is a single-user license that is valid for lifetime, and includes future updates.
Note: Do not upgrade your kernel if you do not know what you are doing.