Random Freezes
Here are the steps:
1. Open the file /etc/default/grub in a text editor.
CRTL+ALT+T sudo nano /etc/default/grub
2. Add the parameter, in this case iommu=soft, to the line starting with GRUB_CMDLINE_LINUX_DEFAULT=, at the end, within the quotes, like so: GRUB_CMDLINE_LINUX_DEFAULT="current parameters iommu=soft".
3. Save the file.
CTRL+O
4. Exit
CTRL+X
4. Update GRUB:
sudo update-grub.
5. Upon next reboot the default boot option should include the parameterreboot
reboot