With Ubuntu 19.10, they moved Chromium from a .deb to a snap install only.

This makes browser startup times much slower and causes weird effects when saving files, and basically made me stop using Chromium as a consequence :-(

Today I found this article which gave the info on how to switch back to a .deb installed chromium and get back to normal.

https://shevchuk.co/notes/2019/12/13/install-chromium-on-ubuntu-1910-from-debian-instead-of-snap