Based on your Laptop specifications (see here) you will need an older Ubuntu version to make it work as fast as you expect.
I have two HP Mini 1000, whose specifications can be reached clicking here, and they suffer when I try to run Ubuntu 20.04, nevertheless, the processor and 2GB RAM is enough to do something with Ubuntu 18.04, which will be supported until April 2021.
Please have in consideration that your computer has a 1.5 GHz microprocessor and my HP Mini 1000 has the 1.6 GHz microprocessor.
While this shouldn't represent a major issue, you may find a slow performance with such difference.
And please have in consideration that you can't use the Ubuntu's official Desktop Environment.
In my Mini 1000 I am using i3WM, but you can go for XFCE Desktop Environment, then you will experience some king of additional speed on the computer's general performance.
Or you should go directly to download the XUbuntu distribution, which is a Ubuntu's derivative OS
The Official XUbuntu Documentation has enough information on how to install it, nevertheless you may wish to give this task to a computer's expert.
But, if you insist on do it on your own, you will need to learn some things.
People in the comments have dropped useful links on how to install Ubuntu, the XUbuntu installation process is not that different, so you will be covered by following these instructions.
Computer's comparison
You can see the differences between your computer and my Mini 1000 by clicking here.
Good luck!