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"This volume is not formatted as APFS" when upgrading Mojave to Catalina #

If your Mojave volume appears as grayed out in the Catalina installer with the message "This volume is not formatted as APFS" when attempting to upgrade:

  1. Boot from Catalina installer
  2. Launch Disk Utility
  3. Select Mojave volume
  4. File → Unmount
  5. Edit → Convert to APFS...
  6. Proceed with Catalina installation

Backup first, proceed at your own risk (and joy), etc.

H/T: klanomath, Redarm, and Antonio23249

/mac | Mar 15, 2021

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