Hi there,
We need more info. Please share the kernel version (uname -a).
It’s weird that lspci don’t show your wifi adapter. Do you happen to know the chipset model? that could help in the search. Seems like a Realtek since you have a Ethernet Realtek adapter as well.
What does sudo dmesg alone returns? Post it.
Post also the result of ‘sudo lsmod’.
Try ‘sudo lshw | grep ireless’ and post it. Another option is to run 'sudo lshw | less ’ and then press “/Wireless” to find any pluged-in adapter, active or not.
Once we have the wireless chipset brand and model number you can get a proper working driver.
Nachosan