WiFi isn't being detected on Lubuntu 18.04

I’m a new Linux user and I can’t get my laptop to connect to WiFi using Lubuntu 18.04. There weren’t any additional drivers I could download. I searched and executed the following commands:

• rfkill list – outputted only bluetooth
• lshw -C network – outputted nothing
• lspci and lspci -knn – outputted nothing related to Network or Wireless connection
• lsusb – same as above

My WiFi adapter is Realtek RTL8723BS 802.11n SDIO. I figured the OS may not be detecting it, according to the results above.
I also tried to connect to the internet by bluetooth tethering, which worked. The WiFi works on Windows normally. What should I do at this point?

Edit: using the command dmesg | grep -i sdio outputs the following:

[   22.819521] mmc1: new high speed SDIO card at address 0001

Edit 2: using the command dmesg | grep -i rtl outputs the following:

[   46.099040] Bluetooth: hci0: RTL: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[   46.103334] Bluetooth: hci0: RTL: rom_version status=0 version=1
[   46.103341] Bluetooth: hci0: RTL: loading rtl_bt/rtl8723bs_fw.bin
[   46.175805] Bluetooth: hci0: RTL: loading rtl_bt/rtl8723bs_config-OBDA8723.bin
[   46.206502] Bluetooth: hci0: RTL: cfg_sz 64, total sz 24508
[   47.025068] Bluetooth: hci0: RTL: fw version 0x365d462e