[extraisland]

What happens when the OS that is running the browser fails to update because /boot has run out of room for a new Linux kernel (this happened to me the other week)?

What happens when the browser update fails because the package database got corrupted?

What happens when a lock file stop the whole system updating because of a previous iffy update?

You are going to need to drop to a terminal and fix that issue or reinstall the whole OS.

Either way you are going to need to know something about how the machine works.

[GoblinSlayer]

Does flatpak update automatically? As for /boot, format the whole drive and make it /boot