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I set a static IP by following the instructions on https://www.itzgeek.com/how-tos/linux/ubuntu-how-tos/netplan-how-to-configure-static-ip-address-in-ubuntu-18-04-using-netplan.html

At first, it worked. However, when I rebooted my laptop, Wifi didn't work anymore. The corresponding information are the following:

networkctl status -a

 1: lo

   Link File: /lib/systemd/network/99-default.link

Network File: n/a

        Type: loopback

       State: carrier (unmanaged)

     Address: 127.0.0.1

              ::1



● 2: enp2s0

   Link File: /lib/systemd/network/99-default.link

Network File: n/a

        Type: ether

       State: routable (unmanaged)

        Path: pci-0000:02:00.0

      Driver: r8169

      Vendor: Realtek Semiconductor Co., Ltd.

       Model: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

  HW Address: ... (ASUSTek COMPUTER INC.)

     Address: 10.5.150.56

              ...

     Gateway: 10.5.148.1 (Cisco Systems, Inc)



● 3: wlp3s0

   Link File: /lib/systemd/network/99-default.link

Network File: /run/systemd/network/10-netplan-wlp3s0.network

        Type: wlan

       State: off (configuring)

        Path: pci-0000:03:00.0

      Driver: rtl8723be

      Vendor: Realtek Semiconductor Co., Ltd.

       Model: RTL8723BE PCIe Wireless Network Adapter

  HW Address: 30:52:cb:ee:5c:c2 (Liteon Technology Corporation)

         DNS: 8.8.8.8

              8.8.4.4

/etc/netplan/01-netcfg.yaml

network:

  version: 2

  renderer: networkd

  wifis:

    wlp3s0:

    dhcp4: no

    addresses: [192.168.43.131/24]

    gateway4: 192.168.1.1

    nameservers:

    addresses: [8.8.8.8,8.8.4.4]

    access-points:

      F3-:

        password: ...

ifconfig -a

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

    inet 10.5.150.56  netmask 255.255.252.0  broadcast 10.5.151.255

    inet6 ...  prefixlen 64  scopeid 0x20<link>

    ether ...  txqueuelen 1000  (Ethernet)

    RX packets 13169  bytes 9405575 (9.4 MB)

    RX errors 0  dropped 0  overruns 0  frame 0

    TX packets 7706  bytes 1033540 (1.0 MB)

    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

    inet 127.0.0.1  netmask 255.0.0.0

    inet6 ::1  prefixlen 128  scopeid 0x10<host>

    loop  txqueuelen 1000  (Local Loopback)

    RX packets 1251  bytes 164695 (164.6 KB)

    RX errors 0  dropped 0  overruns 0  frame 0

    TX packets 1251  bytes 164695 (164.6 KB)

    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



wlp3s0: flags=4098<BROADCAST,MULTICAST>  mtu 1500

    ether ...  txqueuelen 1000  (Ethernet)

    RX packets 0  bytes 0 (0.0 B)

    RX errors 0  dropped 0  overruns 0  frame 0

    TX packets 0  bytes 0 (0.0 B)

    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

So, what can be the problem? Thanks in advance...

First, the gateway address 192.168.1.1 is not in the same subnet with 192.168.43.131/24. One of the two is incorrect.

Second, netplan is very specific as to format, convention, indentation, spacing, etc. You can check an example here:

cat /usr/share/doc/netplan.io/examples/wireless.yaml 

I suggest that you revise your yaml file to:

network:

  version: 2

  renderer: networkd

  wifis:

    wlp3s0:

      dhcp4: no

      addresses: [192.168.43.131/24]

      gateway4: 192.168.43.1

      nameservers:

        addresses: [8.8.8.8, 8.8.4.4]

      access-points:

        "F3-":

          password: "..."

NOTE: Is F3- really the name of your network as the yaml file in your question suggests? Or is it F3 or some other? Substitute your details above.

Next, apply the changes:

sudo netplan apply

Any improvement?