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My box is mid 2012 MacBook Pro, 1 TB HD, Sierra 10.12.6. It has dual-booted with Ubuntu using rEFInd until the High Sierra installation failed, after which I only used Ubuntu. After uninstalling rEFInd I'm attempting to upgrade the macOS side to Mojave and get the error above. I've already run First Aid on the Macintosh HD. Here's the partitioning:

# diskutil list disk0
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            500.4 GB   disk0s2
   3:                  Apple_HFS Recovery HD             650.0 MB   disk0s3
   4:           Linux Filesystem                         498.8 GB   disk0s4
# gpt -r show disk0
gpt show: disk0: Suspicious MBR at sector 0
       start        size  index  contents
           0           1         MBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6         
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640   977270656      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
   977680296     1269536      3  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
   978949832   974313152      4  GPT part - 0FC63DAF-8483-4772-8E79-3D69D8477DE4
  1953262984      262151         
  1953525135          32         Sec GPT table
  1953525167           1         Sec GPT header

Is there a way to install Mojave without reformatting?

  • Excellent details. There are people who know the inner workings and pop up from time to time. I sadly am not that person. I’ve tagged it so they will likely see it next time they are here. – bmike Mar 17 at 22:34

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