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After having resized the Mac partition through the CLI from:

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *250.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            249.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

to

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *250.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            100.0 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

then booting into rEFInd rescue, Disk Utility cannot format the free space:

Partition Failed

partition failed with the error:

couldn't unmount disk.

It's not a pie chart but more of vertical bar. The top partition is Mac, and the bottom partition is free.

Clicking the free space and selecting "format" generates the above error. (I tried a few different formats.)

When I boot a live Linux DVD, won't it just pick up the free space and can it not just install there? It's not necessary to format the free space for Linux from the Mac Disk Utility, is it? Gparted would work, I imagine, at least as well.

(In the context of installing Lubuntu.)

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