hi- Opencore install as per the instructions went flawlessly for me, thanks for this. I have a Mac Pro 4,1/5,1, running Catalina and Windows 10 on separate SSDs. Opencore is installed to allow me to choose OSs, and also to give boot graphics on an installed RX580.
Is there any trick to getting a 3rd option, of Linux on a 3rd separate SSD for triple boot? I installed Ubuntu on a separate SSD, after I disconnected all other drives.
Ubuntu on its own (no other drives connected) boots straight away. But, if I power down, reattach my Catalina drive and restart, I dont get the OC loader; it just goes straight into Ubuntu. I've tried this with a couple of different versions of Ubuntu for testing.
If I then power down and disconnect Ubuntu, and restart, OC appears and I can boot Catalina.
So far, I've tried:
1) selecting the startup disk in preferences in Catalina, which didn't change anything
2)resetting the NVRAM. After 2 or 3 zaps, I could see a "NO NAME" additional entry in the boot picker, but this won't boot. It generates an error complaining that it has "failed to load MoklistRT: invalid parameter. Could not read \EFU\".
The fix for this seems to be to replace shimx64.efi with grubx64.efi in the Ubuntu EFI Partition. However, this hasn't worked for me and results in the system still complaining of failing to load MoklistRT on reboot.
Is triple boot possible?