I'm using Ubuntu 18.04, and I really like this font-family.
Soon, I will replace my laptop. And I want to take this font to my new laptop.
Can I know what is font-family that used in Ubuntu 18.04?
I think it is sans-selif font, but I couldn't find the name.
The default font in Ubuntu is called "Ubuntu" (surprise ;-) ).
You can find more details about it here: https://design.ubuntu.com/font
The font is distributed under an open source license and you can download it from the above Ubuntu website, Google Web Fonts and a few other places.
