It looks like you're asking for a guide to get a working when the driver name seems to reference RTL (likely Realtek) and a possible version like RTL8812AU , RTL8192 , or something similar (your "rtl19oct" might be a typo or shorthand).
lsmod | grep rtl dmesg | tail -20
Open a terminal and type lsusb . Look for the Realtek device line. wireless usb adapter driver rtl19oct work
To ensure the new driver takes precedence, the existing kernel module must be blacklisted. wireless USB adapter It looks like you're asking
# Command to disable power saving sudo iwconfig wlan0 power off wireless usb adapter driver rtl19oct work