If you get this during the boot process of Fedora, you might know that pressing on enter will continue the boot process. If you however don’t want your boot process to stop at the “Invalid partition table!” error, then you should do the following. With the next installation of Fedora, choose “standard partition” in the Anaconda installer (see picture below), the default setting is “lvm” which is the cause of this error.
Edit: I know on the Dell site, people blame this error on an outdated BIOS. But I still got this error after updating my BIOS.