Cannot boot Mac Fusion drive since installing reFind + Ubuntu

[woolfie]

I have an older Mac Mini (Intel, can't remember the year) that I installed Ubuntu 22.04.3 LTS on following the instructions at https://www.makeuseof.com/tag/install-linux-macbook-pro/

As per the instructions, I re-enabled the System Integrity Protection in MacOS after creating the Ubuntu partitions (in Mac Disk Utility) before actually installing Ubuntu.
Since installing, I am unable to boot back into MacOS. I've installed refind on the linux side so I now do have a boot menu, but whenever I pick any of the Mac partitions to boot it gets halfway through booting; an Apple logo screen with progress bar that gets to approximately halfway, then a grey fail screen logo (circle with diagonal line) appears and it halts and needs power-cycling to recover.
I read through https://sourceforge.net/p/refind/discussion/general/thread/b9b50e68e3/ hoping for a silver bullet, but no luck.

I really need to be able to boot back into MacOS and access the data on the Fusion drive (yep, didn't make a back-up... shoulda, coulda, didn't :-( )
Here are the results of the diagnostic commands recommended in that thread:

macbuntu:~$ sudo parted -l
Model: ATA TOSHIBA MK5065GS (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size    File system     Name                  Flags
 1      20.5kB  210MB  210MB   fat32           EFI System Partition  boot, esp
 2      210MB   365GB  365GB                   Fusion
 3      365GB   366GB  650MB   hfs+
 4      366GB   373GB  7215MB  linux-swap(v1)                        msftdata
 5      373GB   500GB  127GB   ext4                                  msftdata


Model: ATA OCZ-VERTEX4 (scsi)
Disk /dev/sdb: 128GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size   File system  Name                  Flags
 1      20.5kB  210MB  210MB  fat32        EFI System Partition  boot, esp
 2      210MB   128GB  128GB               Fusion
 3      128GB   128GB  134MB  hfs+         Booter


macbuntu:~$ 
macbuntu:~$ sudo blkid /dev/sda2
/dev/sda2: PARTLABEL="Fusion" PARTUUID="1231a334-352b-4fb7-a45c-bd18a9b778e3"
macbuntu:~$ sudo blkid /dev/sda3
/dev/sda3: UUID="1df92ad7-2fec-3f38-981d-e6c6daac6d65" BLOCK_SIZE="4096" LABEL="Recovery HD" TYPE="hfsplus" PARTUUID="96ad45ee-50bb-40da-890b-633fd09146e7"
macbuntu:~$ sudo blkid /dev/sdb2
/dev/sdb2: PARTLABEL="Fusion" PARTUUID="9cb2ffd4-045a-4f52-9f6f-82005780999e"
macbuntu:~$ sudo blkid /dev/sdb3
/dev/sdb3: UUID="18299145-da79-388f-a3e4-f5d18ec8cb83" BLOCK_SIZE="4096" LABEL="Boot OS X" TYPE="hfsplus" PARTLABEL="Booter" PARTUUID="082d1659-6652-44d3-a75b-e0e5b827cb93"
macbuntu:~$ sudo mount /dev/sda2 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.
macbuntu:~$ sudo mount /dev/sda3 /mnt
macbuntu:~$ sudo find /mnt -iname "boot*efi"
/mnt/com.apple.recovery.boot/boot.efi
/mnt/System/Library/CoreServices/boot.efi
macbuntu:~$ sudo umount /mnt
macbuntu:~$ sudo mount /dev/sdb2 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sdb2, missing codepage or helper program, or other error.
macbuntu:~$ sudo mount /dev/sdb3 /mnt
macbuntu:~$ sudo find /mnt -iname "boot*efi"
/mnt/System/Library/CoreServices/boot.efi
macbuntu:~$ sudo umount /mnt
macbuntu:~$ sudo gdisk /dev/sda
GPT fdisk (gdisk) version 1.0.8

Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): p
Disk /dev/sda: 976773168 sectors, 465.8 GiB
Model: TOSHIBA MK5065GS
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 50C65087-AE4F-4AE1-900D-CC84F2F0E5FF
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 8-sector boundaries
Total free space is 526078 sectors (256.9 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       713234623   339.9 GiB   FFFF  Fusion
   3       713234624       714504383   620.0 MiB   AF00  
   4       714506240       728598527   6.7 GiB     0700  
   5       728860672       976511062   118.1 GiB   0700  

Command (? for help): i
Partition number (1-5): 2
Partition GUID code: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF (Unknown)
Partition unique GUID: 1231A334-352B-4FB7-A45C-BD18A9B778E3
First sector: 409640 (at 200.0 MiB)
Last sector: 713234623 (at 340.1 GiB)
Partition size: 712824984 sectors (339.9 GiB)
Attribute flags: 0000000000000000
Partition name: 'Fusion'

Command (? for help): i
Partition number (1-5): 3
Partition GUID code: 48465300-0000-11AA-AA11-00306543ECAC (Apple HFS/HFS+)
Partition unique GUID: 96AD45EE-50BB-40DA-890B-633FD09146E7
First sector: 713234624 (at 340.1 GiB)
Last sector: 714504383 (at 340.7 GiB)
Partition size: 1269760 sectors (620.0 MiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): i
Partition number (1-5): 4
Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: E9296DA3-ACAA-4F37-9F8F-D8594C7DFA75
First sector: 714506240 (at 340.7 GiB)
Last sector: 728598527 (at 347.4 GiB)
Partition size: 14092288 sectors (6.7 GiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): i
Partition number (1-5): 5
Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: C06BCD45-8AF7-4CD1-AAA8-09D4FED01A01
First sector: 728860672 (at 347.5 GiB)
Last sector: 976511062 (at 465.6 GiB)
Partition size: 247650391 sectors (118.1 GiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): q
macbuntu:~$ sudo gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p
Disk /dev/sdb: 250069680 sectors, 119.2 GiB
Model: OCZ-VERTEX4     
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 0C891CF8-7EFE-4C51-B4C9-07C042C530B4
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 250069646
Partitions will be aligned on 8-sector boundaries
Total free space is 13 sectors (6.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       249807495   118.9 GiB   AF05  Fusion
   3       249807496       250069639   128.0 MiB   AB00  Booter

Command (? for help): i
Partition number (1-3): 2
Partition GUID code: 53746F72-6167-11AA-AA11-00306543ECAC (Apple Core Storage)
Partition unique GUID: 9CB2FFD4-045A-4F52-9F6F-82005780999E
First sector: 409640 (at 200.0 MiB)
Last sector: 249807495 (at 119.1 GiB)
Partition size: 249397856 sectors (118.9 GiB)
Attribute flags: 0000000000000000
Partition name: 'Fusion'

Command (? for help): i
Partition number (1-3): 3
Partition GUID code: 426F6F74-0000-11AA-AA11-00306543ECAC (Recovery HD)
Partition unique GUID: 082D1659-6652-44D3-A75B-E0E5B827CB93
First sector: 249807496 (at 119.1 GiB)
Last sector: 250069639 (at 119.2 GiB)
Partition size: 262144 sectors (128.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'Booter'

Command (? for help): q
macbuntu:~$ 

Thanks,

Iain

[woolfie]

Anyone have any suggestions on what I can try? I still stumped by this.

Thanks,
Iain

[joevt]

Install macOS to an external drive and troubleshoot the fusion drive from there.