Ni wifi-adapter found

I have install ubuntu 18.04 on Lenovo but couldn't connect to wifi network as i have this error message:
No wifi-adapter found. (Driver for the wifi is realtek (rtl8821ce)).
Would you please help?
Thanks in advance

It is in Synaptic. I really recommend Synaptic for software and drivers.
"sudo apt-get install synaptic"

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