Sorry that my English is not good.
My wireless card is Wireless-N 7260, it worked fine with 18.12.0 drivers, but when I install the 18.12.1 drivers, it's somehow mistaking my 7260 as the model 7265, where in device manager it changed from Wireless-N 7260 to Wireless-N 7265, wrong drivers for the wrong card, that is why my network adapter is missing in control panel and the system cannot detect the device but still in device manager it says the device is running.
Now my computer have no way to connect to the internet without ethernet.
Intel recommends that you always use latest drivers offered by your computer manufacturer first. There are two version of this N adapter, the Intel® Dual Band Wireless-N 7260 and the Intel® Wireless-N 7260 (this one being single-banded) which one do you have? Please make sure you installed the right driver for the right adapter. If you are not too sure which one do you have, please contact your computer manufacturer for further information: Computer Manufacturer Support
For the Intel® Dual Band Wireless-N 7260 you may try the following: Intel® PROSet/Wireless Software for Windows® 10 - Please make sure to observe your operating system architecture if it is 32 or 64 bit. Click on this link: Intel® Dual Band Wireless-N 7260: Product Brief for the more information.
For the Intel® Wireless-N 7260 you may try the following: Intel® PROSet/Wireless Software for Windows® 10 - It is also important that you follow the same procedure informed above for the dual band version. Click on the link: Intel® Wireless-N 7260: Product Brief
Mine is dual-band wireless-n 7260, and I did download the 64 bit win10 version, Sony claims they used intel drivers and it should work perfectly, but apparantly, I'm only have been successfully install the driver only after a clean install of windows 10, upgrades somehow just installs drivers for other hardware.
Please try the following:
1. Remove this hidden folder:
2. Remove drivers, Intel® PROSet/Wireless Software, temp files and hidden folders. Then reboot computer. Let Windows* install driver.temp files:1.On the keyboard, press Win + R to open Run dialogue box.
2.On search box, type %temp% and press OK.
3.This will open one of Windows temporary files folder. Select all files and delete them.
To select all files, click on any file within folder and press ctrl + A.
If any files are been used by computer, then you might get a message that says "File in use" or "Folder in use". Click on Skip to continue.Once all files are removed, please proceed with the installation.Let us know if this worked for you.