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Recently I installed Ubuntu next to Windows 10 and when I try to connect it to wifi it says "wifi adapter not found".

For every solution I've seen it says I need ethernet (I'm using USB ethernet through my phone, I don't know if that is a problem).

I have secure boot disabled and when I go to Additional Drivers it says that there are no additional drivers found.

If I enter the command lspci -knn | grep Net -A3; rfkill list I get

03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]

    Subsystem: Hewlett-Packard Company RTL8821CE 802.11ac PCIe Wireless 

Network Adapter [103c:831a]
0: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no