Those who have the issue should install this grub package and confirm it is working …
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Now there was an update for grub. installed it. everything is fine after reboot. also after “update-grub” command and reboot everything works like a charm. thank you very much, philm!!!
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Administratively marked as solved 
to show as visible solution for everyone !
Same experience. Installed with my fingers crossed, restarted and everything stayed fine. 
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