I have successfully installed ubuntu 18.04.3 LTS, and at the beginning i've successfully connected to my wireless network, but after restarting the wifi adapter was not found. I've connected to the internet through lan cable and installed successfully wifi drivers. After that the wifi was fully functional, but after restarting there was the same issue- no wifi adapter. It was really annoying to install wifi drivers on every restart, and if you can help me i will be very grateful.
Network adapter is: Intel(R) Wireless-AC 9462
Thanks for helping.