Problem with internet connection on Ubuntu 20.04

Question

I can't connect to the internet on Ubuntu 20.04. I checked many things:

1. The wireless adapter is enabled.
2. Localhost ping is OK.
3. Ping to 8.8.8.8 is ok.
4. I can connect to the Internet via cable.
5. I can connect to the Internet through a mobile hotspot.
6. I reinstalled my wireless network drivers
7. I updated my software driver

Although I can connect to the Internet through the modem with other devices, my laptop cannot connect to the Internet in the same way.

The output of lspci -knn | grep Net -A3:

03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:804c]
    Kernel driver in use: rtl8723be
    Kernel modules: rtl8723be

The output of uname -a; dkms status:

Linux siamak-HP-Notebook 5.19.0-32-generic #33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 30 17:03:34 UTC 2 x86_64 x86_64 x86_64 GNU/Linux