I’m experimenting with a 2014 macbook pro upgraded to macOS 14.4 (Sonoma) with OpenCore Legacy Patcher, Linux Mint 21.3 Virginia and Linux Mint 21.3 Xfce.
First, I installed Linux Mint 21.3 Virginia and I could boot both to macOS and Mint. Then, I created another partition and installed Mint Xfce on it.
Now, I can only access both linux operative systems and macOS has disappeared.
What I don’t understand is why now the notebook boots directly to grub instead of booting to OpenCore Legacy Patcher
I’m not sure about that patcher but it sounds like you installed grub over your previous bootloader. Back in the day we used to boot off rEFIt. Is that still a thing? You could install it from another mac if you put the broken boy into target disk mode.