dmesg AER: Multiple Uncorrected (Non-Fatal) error received

When Installing Ubuntu or other Linux distros you might get these errors in your debug message log you can view with this cmd:

dmesg

AER: Multiple Uncorrected (Non-Fatal) error received
PCIe Bus Error: serverity=Uncorrected (Non-Fatal), type=Transaction Layer, (Requester ID)

You can fix the problem by modifying grub boot loader and disabling memory mapping support.

First open grub conf file as root

sudo gedit /etc/default/grub

Add this CMDLINE_LINUX_DEFAULT argument:

pci=nommconf

The resulting grub file should be this:

Note that I removed “quiet splash” this is to see debug messages at boot time instead of the logo

Don’t forget to update grub with your new changes:

sudo update-grub

Just need to reboot and the error should disapear.

Alternatives

Another way to make the messages disapear is to use:

pci=noaer

but this just masks the errors (No Advance Error Reporting), although you should not experience any issues as reported by many users

Might want to also check if your BIOS can be updated. Some users reported a bios update fixes the issue. In my case I already had the lastes bios version