Description of problem:
------------------------

In Fedora 28 Workstation, the GRUB loader is buggy.
After booting in Windows, there is a "TPM Error 2" when booting Fedora,
    and then system hangs. 


Version-Release number of selected component (if applicable):
 Fedora 28 Workstation X86_64

How reproducible:
    SOLID

Steps to Reproduce:
1.  Install Fedora 28 x86_64, with a Windows 10 Partition
2.  Boot Fedora : it works, boots normally
3.  Boot Windows 10: it works, boots normally, but modify TPM register
4.  Boot Fedora : it fails with "TPM Error 2"... and hangs!

Actual results:
Need to reset the BIOS, clear the TPM to be able to boot again !

Expected results:


Additional info:
-----------------

  1) Matt Garrett documented this issue one year ago, as :

https://bugzilla.redhat.com/attachment.cgi?id=1160008&action=diff

  2) A nice workaround may be to use an older, Fedora 27 set of packages for Grub, but dependencies problems are complex...

  3) Grub-customizer does not work, but the grub-customizer package from Fedora 27, seems to work juts fine : a simple workaround...