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I recently downloaded Ubuntu for my Samsung 5 Chromebook from:

Whenever I restart the computer, it goes back to Chrome OS. How can I make it so that it boots into Ubuntu?

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Use: sudo cgpt add -i 6 -P 5 -S 1 /dev/mmcblk0 for ARM

sudo cgpt add -i 6 -P 5 -S q /dev/sda for Intel Chromebooks

This should set Ubuntu to be the default boot OS.

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