You can try the following kernel parameters for the error messages related to pcieport
Edit: The kernel parameters get added to the default grub file in /etc/default/grub and then update grub with sudo grub-mkconfig -o /boot/grub/grub.cfg
pci=nomsi
pcie_aspm=off
The wireless and ethernet has nothing to do with the r8168 so you could uninstall it. Your wireless chip is RTL8188EE and your Ethernet is an Intel I219-V