This kernel error indicates a conflict in the Linux sysfs filesystem, specifically within the USB-C/Thunderbolt stack on your Dell Precision 5560.

Cause of the Error
The error sysfs: cannot create duplicate filename occurs because the kernel is attempting to create a symbolic link (symlink) for a Thunderbolt “partner” device (e.g., a dock or external monitor) that already exists in the system’s device tree.

Conflict Point: The path /devices/platform/USBC000:00/typec/port0/port0.0/partner is being registered a second time, likely by the typec-thunderbolt driver.
Underlying Issue: This often happens when a Thunderbolt device is re-plugged or enumerated twice during boot, or if the driver fails to properly clean up old entries before trying to create new ones.