'Detecting File System in installation of Ubuntu 20.04 takes really long

I am currently installing Ubuntu 20.04 on my computer and chose the 'Erase disk and clean install' function, without internet, a minimal installation and no automatic driver installation.

Right now it's really slow with installing, constantly giving errors like:
Warning: Source ID 20763 was not found when attempting to remove it Glib.sources_remove(self.rows_changed)

The ID is slowly rising, like with +400 every 2 minutes. But I doubt this should be happening, or that the ubuntu installation should be taking this long.

Does anybody know a work around, or how to fix this? Thanks in advance!



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