Hi

I am pasting on this old forum because being a new user at Level 0 I have "access denied" to create a post on the new Discourse system - even though there is are admin messages saying new users should be able to post on "Support and Help"

The issues to discuss.

1. I have problems booting from a Linux disk on Mac Pro 5,1 with OCLP 2.0.2 installed. The boot process was working but "something happened" (TM) and I could no longer boot form the Linux disk on the Mac Pro 5,1. OCLP support states this is not an OCLP problem - but a Linux problem. (see below)

2. I placed the Ubuntu SSD in a USB caddy, plugged it into a PC and that booted into the Ubuntu system no problem

3. I ran Ubuntu boot-repair on the PC and it generated a pastebin diagnosis (follows). https://paste.ubuntu.com/p/MKR8CZ9jks/
I can see that boot repair has detected the Windows 10 installation on the PC. All other drives are data storage such as Windows storage space to "lump together" some old hard drives.


Objective:

To make the Ubuntu Linux disk bootable on the Mac Pro



Original boot problem on Mac Pro 5,1



The error messages I now get when I select the Ubuntu Linux 22.04 drive from the OCLP boot picker are


Could not read /EFI/ : Invalid parameter
Error: could not find boot options: Invalid parameters start_image() returned Invalid Parameter
OC: Boot failed – Invalid parameter
OCB: StartImage failed – Invalid Parameter
The error messages I now get when I select the Ubuntu Linux 22.04 drive from the OCLP boot picker are


Could not read /EFI/ : Invalid parameter
Error: could not find boot options: Invalid parameters start_image() returned Invalid Parameter
OC: Boot failed – Invalid parameter
OCB: StartImage failed – Invalid Parameter