Don't know if this is useful, but it took me a while to figure it out. Thanks to user k1l from IRC channel. In order to force your machine (ubuntu, powerpc, yaboot) to boot to shell mode and not gui:
1. Enter in terminal:
2. RebootCode:sudo systemctl set-default multi-user.target
Voila !
If you need to reverse this:
1. Enter in terminal:
2. Reboot.Code:sudo systemctl set-default graphical.target
Thanks k1l !!
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