I'm trying to install a dual boot Windows 10/Ubuntu 18.04 on my XPS 7390 Developer Edition. Initially Ubuntu 18.04 was installed by Dell. Wifi worked flawlessly on this version.
Today I installed Windows and then a dual boot with the standard Ubuntu 18.04 distribution. This worked, but the Wifi-Card was not being identified in this Ubuntu version.
Now I used the Dell Recovery ISO to get back to the inital state. Wifi is working again. But I still want the dual boot. Is there any way to get the drivers that Dell put in their custom Ubuntu? While they offer windows drivers for the Killer Wifi Card on their website I can't seem to find any ubuntu drivers.
As requested by @Pilot6:
~$ lspci -knn | grep Net -A3; rfkill list
02:00.0 Network controller [0280]: Intel Corporation Device [8086:2723] (rev 1a)
Subsystem: Bigfoot Networks, Inc. Device [1a56:1653]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
03:00.0 PCI bridge [0604]: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] [8086:15d3] (rev 02)
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
