Ubuntu HowTo: “authentication required by wireless network” on Ubuntu 18.04.2 LTS, RTL8821AE

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I’ve just installed Ubuntu 18.04.2 on my system alongside Windows 10 and I can’t seem to connect to my Wifi. It always shows “Authentication required by wireless network” and even if I type in the correct password and click connect it keeps showing this message and I can’t connect.

02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter [10ec:8821]
    Subsystem: Lenovo RTL8821AE 802.11ac PCIe Wireless Network Adapter [17aa:a814]
    Kernel driver in use: rtl8821ae
    Kernel modules: rtl8821ae
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
0: ideapad_wlan: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: ideapad_bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
3: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no

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