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invalid literal for int() with base 10: '"20"\n'
File: /etc/default/grub
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GRUB_TIMEOUT="20"
Remove the "" around 20 or whatever you have the timeout set to above so it reads
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GRUB_TIMEOUT=20
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grub-mkconfig -o /boot/grub/grub.cfg
It turns out if you use a tool like grub-customizer to modify GRUB then it automatically adds the "" marks around the GRUB_TIMEOUT value.