Can I install Oracle XE or any free version on Ubuntu 18.04?

I just wanna know if Oracle XE or any free available version of Oracle is compatible with any of the Ubuntu versions.

As far as I know:

• Ubuntu isn't certified with Oracle database
• 11gXE is an old version; it comes without support anyway
• so, if you hit any problems, don't expect "official" support from Oracle
• there are walkthrougs available on the Internet which show how to install 11gXE on Ubuntu, so it is possible (I never did it; never had to)
  • people who did it usually spent days if not weeks to make it work

Basically, YMMV.