为什么安装了gnome软件的Ubuntu软件启动器消失了

我安装了常规的gnome软件,以便也可以安装Flatpaks。在我这样做之后,一切都很好:我可以在启动器概述中看到“软件”和“ Ubuntu软件”,然后启动它们中的任何一个。

However, after a restart, I could no longer see Ubuntu Software, and installed Snaps weren't present in the menu anymore either. I have since uninstalled gnome-software, un- and re-installed both Ubuntu Software (snap remove snap-store and snap install snap-store) and the Snap app I'm testing with, and restarted, but I still can't see them.

为什么会这样呢?