On MacBookPro, Mid-2012 13″, A1278 particulars https://everymac.com/programs/apple/macbook_pro/specs/macbook-pro-core-i5-2.5-13-mid-2012-unibody-usb3-specs.html
Primary SSD(upgraded from HDD few years earlier than) is OSX 10.15.7.
I’ve changed Optical drive with 2TB SSD (https://www.ifixit.com/Information/Putting in+MacBook+Professional+13-Inch+Unibody+Mid+2012+Twin+Laborious+Drive/13787).
Put in kubuntu-22.04.5-desktop-amd64.iso on second ssd.
Reboot macbookpro
maintain alt/choice key, choose EFI Boot boot, first in line, after that’s unique OSX disk
get display “GNU GRUB model 2.06” with choices
Ubuntu
Superior choices for Ubuntu
choose “Ubuntu”
black display, after that
error: failure studying sector 0xd4dbc0 from hd7.
error: you have to load the kernel first.
Press any key to proceed...
it goes robotically (even when I don’t press any key) to “GNU GRUB model 2.06”
In “Superior choices for Ubuntu” I’ve:
Ubuntu, with Linux 6.8.0-45-generic
Ubuntu, with Linux 6.8.0-45-generic (restoration mode)
Ubuntu, with Linux 6.8.0-40-generic
Ubuntu, with Linux 6.8.0-40-generic (restoration mode)
Each alternative is similar textual content , besides 0x totally different
Loading Linux 6.8.0-40-generic ... (few second or as much as 2-3 minutes on it)
error: failure studying sector 0x14baa00 from hd7.
Loading preliminary ramdisk ...
error: you have to load the kernel first.
Press any key to proceed...
This individual did all the pieces as me and it’s working wonderful, however not for me:
https://www.reddit.com/r/mac/feedback/az2nrn/linux_dual_boot_on_2012_macbook_pro/
right here is one other opinion what to strive:
The issue comes from Apple has restricted booting another OS on a Mac pc that got here with a inbuilt DVD drive from solely that DVD drive. An OS X installer will be booted from a USB port, from the USB thumb drive or DVD drive linked to a USB port however you may’t boot Home windows or Linux from the USB port.
So the one technique to set up Ubuntu, or another OS than OS X. is to reinstalled the DVD drive and put the drive you need the opposite OS on in the primary drive bay. As soon as it’s put in you may transfer the drive to the optical bay.
https://discussions.apple.com/thread/5992651?sortBy=rank
Whether it is attainable to twin booting one OS (the place second is Luks encrypted Linux ) on every of the SSD drives ?