*** This bug is a duplicate of bug 1875841 ***
https://bugs.launchpad.net/bugs/1875841
** This bug has been marked a duplicate of bug 1875841
package chromium-browser 80.0.3987.163-0ubuntu1 failed to install/upgrade:
new chromium-browser package pre-installation script subprocess returned
An user called chirag patel solves the problem and posted it on Medium:
https://medium.com/@chiragpatel_52497/unable-to-install-package-name-
snap-package-name-has-install-snap-change-in-progress-b6768f2ce81d
This solves the problem:
Snap is probably still working on something in the background (