Boot from USB locks up after GRUB Bootloader


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I am suffering from some odd system behavior:

  • USB drive has been created with the Wizard as well as manually.
  • UEFI Boot configuration (as the Legacy boot will not work properly in general on my HW)
  • Tried with different USB 2.0 and 3.0 drives, sizes 8GB to 32GB.
  • Tried official Unraid 6.9 and latest 6.8 releases.
     
  • USB drive is recognized in the BIOS as a bootable device and set to first boot option (no other bootable options / entries present)
  • Boot from USB does start the Bootloader and presents the Unraid choices + Memtest.
  • Any choice I pick results in a locked up / frozen system!:
    • Loading /bzimage... ok
    • Loading /bzroot... ok
    • Screen switches to boot process, displays some lines about boot process then the system locks up, hard.
    • Examining the displayed boot process, I cannot find any issues, errors, warnings. ( I can provide a screenshot later.)
       
  • Choosing the Memtest option also locks up the system!
    • I can run a standalone Memtest bootable USB no problem (Memtest made several passes w/o any errors found.)
  • Windows 10 setup from USB as well as a full install from SATA drive boots just fine.
     
  • I have been over the BIOS settings regarding USB. 
    I do not expect to be those at the core of the issues since the bootloader does come up.

 

Any ideas how to troubleshoot this, what else to try?
 

Edited by diewurst
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