First you have 4 GB or 8 GB pan drive, blank DVD 4 or 8 GB and or SD card above 4 GB.
If you have an SD card then a card reader is a must for PC.
If you do not have any of these then you can buy from here.
Buy 8 Gb Pandrive-Sandisk ⬅️
Buy 4.7 Gb HP-DVD ⬅️
Buy 16 Gb SD-Card ⬅️
Buy Zebronics Card-Reader ⬅️
Now go to any search engine in Google, Yahoo and Yandex and search Ubuntu and open Ubuntu’s site.
Now above you will see the option of download, click on it.
Now you will have the option for Ubuntu 18.04 desktop, click in it and download it.
You can also download ISO from here ubuntu 18.04 Download ⬅️
Microsoft ✓Now You Need iso Burn software for Windows Click This ➡️ Rufus and Install.
MacOs, Linux, Microsoft ✓If you already have Linux installed, then you balena-etcher ⬅️open it and Download It.
For Windows✓ DVD Burner Software Burnaware.exe Download and install on Your PC.
Linux Brasero-Burn for Dvd✓
Now you open those ISO burn software like Ruffus, burnaware, etcher,
Now put a blank DVD or pen drive on your PC, if you have an SD card, then put it in the card reader and connect it to the PC.
Now select Ubuntu ISO and click on burn.
Do not shut down or log out of PC or laptop until Ubuntu ISO burn is over.
When ISO burn completes, remove it and add it to whichever PC or laptop you want to install Ubuntu, connect the charger to the PC.
Press the power button and press F12,
Press 3-4 times, there you will get the option like DVD, PenDrive(USB), click on whatever you have connected to your PC as if I have added pendrive, then I will click in PenDrive(USB).
Now install ubuntu or try ubuntu The option of will come, if you want to try using, try ubuntu Click into And if you want to install, then click on install Ubuntu.