Hi @franc01s,
I’m also using an I-219 V Intel ethernet card with Qubes-OS, my network works:
user@sys-net:~$ lspci | grep Ethernet
00:06.0 Ethernet controller: Intel Corporation Device 0d4f
user@sys-net:~$ lspci -v -s "00:06.0"
00:06.0 Ethernet controller: Intel Corporation Device 0d4f
Subsystem: Intel Corporation Device 2081
Physical Slot: 6
Flags: bus master, fast devsel, latency 64, IRQ 71
Memory at f2000000 (32-bit, non-prefetchable) [size=128K]
Capabilities: <access denied>
Kernel driver in use: e1000e
Kernel modules: e1000e
user@sys-net:~$ ip a show dev ens6
2: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 1c:69:7a:aa:bb:cc brd ff:ff:ff:ff:ff:ff
inet 192.168.1.99/24 brd 192.168.1.255 scope global dynamic noprefixroute ens6
valid_lft 2683sec preferred_lft 2683sec
inet6 fe80::aaaa:bbbb:cccc:dddd/64 scope link noprefixroute
valid_lft forever preferred_lft forever
user@sys-net:~$ uname -a
Linux sys-net 5.6.16-1.qubes.x86_64 #1 SMP Sun Jun 7 06:13:04 UTC 2020 x86_64 GNU/Linux
I think you should update your kernel as I explained it in the mailing-list last summer. But it could be complex for you, I don’t know your Linux skills…
A simpler solution is to test the 4.1 alpha ISO.