I don't know if it fix the problem or just hide it out, but I manage to stop the plymouth messages in boot by editing /etc/default/grub and setting the GRUB_CMDLINE_LINUX_DEFAULT="noplymounth". (and updating grub after that)
I don't know if it fix the problem or just hide it out, but I manage to stop the plymouth messages in boot by editing /etc/default/grub and setting the GRUB_CMDLINE_ LINUX_DEFAULT= "noplymounth" . (and updating grub after that)