[Qlustar General] No Bootable Device Found during post install boot

Hej,

I was attempting to install Qlustar using latest installer (Qlustar Installer 12.0.1-0) on a few years old SuperMicro server. Installation seemed to go smooth, but after first reboot popped up boot error message that no bootable devices were found.

During another installation attempt I noticed a couple of error message: * Failed to fetch file ..postfix... Hash sum mismatch * Failed to fetch file ..python-slurm... Hash sum mismatch * Failed to fetch file ..python3-slurm... Hash sum mismatch AND *GRUB/10-setup FAILED with exit code 127

After that installer says: Good news! No errors found in log files

Do you have any ideas what could be an issue and what to do?

Cheers, Iggy