Can I upgrade Xubuntu 18.04 32-bit?

I want to know if it is possible to update to Xubuntu 20.04 since I can't find a 32-bit version.

If I update through the terminal with

sudo apt update && sudo apt -y dist-upgrade

will the system break?

Thank you!

sudo apt dist-upgrade will only upgrade your system packages keeping it at 18.04.

In quick answer - No. You should remain on Xubuntu 18.04 LTS if you need to use x86 or 32-bit, as it will be fully supported until April-2021 (3 years from release, 5 years applies to main Ubuntu only)

Xubuntu 18.10 was released in x86/32-bit, as was Lubuntu 18.10.

Xubuntu 19.04 and Lubuntu 19.04 were also producing 32-bit or x86 (i386/i686) ISOs during the start of the development cycle for disco, but were only available in the alpha phasewith both stopping December 2018 (Xubuntu early Dec-2018, Lubuntu just prior to Christmas-2018).

The upgrade path to 19.10 was stopped prior to 19.10's actual release, so whilst it was possible to release-upgrade during the development cycle, the infrastructure that created the packages was being turned off (then turned on again for specific packages only), and it made no sense to be running 19.10 on x86. No system packages exist for 20.04, outside of x86 packages required for specific packages.

I'll suggest you read these posts for more information.

https://discourse.ubuntu.com/t/intel-32bit-packages-on-ubuntu-from-19-10-onwards/11263

https://ubuntu.com/blog/statement-on-32-bit-i386-packages-for-ubuntu-19-10-and-20-04-lts