It wasn't being updated by update-grub. Maybe a rookie mistake but, I never had update-grub fail to update before. I tried to update with grub-mkconfig and to reinstall grub via grub-install. None of them worked. What worked was what was suggested in this link https://serverfault.com/questions/648468/modifying-kernel-cmdline-in-ubuntu .
create the directory /etc/default/grub.d
create a file ending with “.cfg” in that directory.
add the following to it:
Code:
GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT} intel_iommu=on"
run update-grub.
edenprairie
commented
3 years ago 
It wasn't being updated by update-grub. Maybe a rookie mistake but, I never had update-grub fail to update before. I tried to update with grub-mkconfig and to reinstall grub via grub-install. None of them worked. What worked was what was suggested in this link https://serverfault.com/questions/648468/modifying-kernel-cmdline-in-ubuntu .
create the directory /etc/default/grub.d
create a file ending with “.cfg” in that directory.
add the following to it: Code: GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT} intel_iommu=on" run update-grub.
Rebooted and everything works. Thank you!