Any support for old Ubuntu?

Hello, i was wondering if there was a thing like Supermium/Pale Moon but for Linux (Ubuntu in my case), because i see a lot of people making old browsers for old windows, some people still use XP on their other laptops. I was wondering if there's something like that for old Linux, Because it would be really cool, i kind of want to try Ubuntu on my 2011 laptop (HP EliteBook 8460w) and i know it can run modern Ubuntu just fine (it has 16 GB RAM and a decent i7 from the time) But what about something period correct?