Dual boot with Windows 10 Pro and Ubuntu 18.04.1 LTS. Dell XPS came with Ubuntu native. I added the dual boot with media Microsoft sent. I was able to partition and install. When the Windows installed, it could not detect a network? Internet still works fine on Ubuntu. Need Windows for work. I have DLed the driver I think I need in Ubuntu, but have no way to get it over to Windows. Is there a way to do it in Ubuntu? I am very new to this.
Boot Windows, disable its fast startup feature. Nowit's "safe" to mount the Windows drive in Ubuntu with read/write permissions.
Reboot to Ubuntu, open the file manager and click on the Windows drive to mount it. Now you can copy/move the driver files to your Windows partition. Avoid writing or changing anything else outside your (Windows) user's space (suggestion: Copy/Move the files to your user's downloads folder in Windows).
This answer is provided for your convenience only and to solve a specific problem. Please avoid doing this routinely. If you need to shares files between Windows and Ubuntu in the same drive use a separated data partition (NTFS).