Uninstall Kali Linux from triple boot

dual-boot grub2 uninstall kali

Solution 1:

  1. Backup your data
  2. Boot into Ubuntu
  3. Delete the Kali partition(s), using GParted or other partitioning software
  4. Run sudo update-grub and reboot

Paraphrased from here: Remove OS from Linux Dual-Boot - Super User

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