I boot my pc in ubuntu for the first time and I did never work before on ubuntu but after booting I wasn't able to see the wifi icon like windows had, I want to connect my PC with my smartphone wifi after ubuntu but I wasn't able to do this.

in ubuntu the wifi icon is probably on the top right of your screen. Or, you may have to go into settings and click on network settings in order to access the wifi settings.

What's the output of diagnostics in the terminal using the command "inxi -Fxxxrz" (without the quotes)?

Note that this will filter out identifiable data such as your mac addresses. Only paste the output, not the command itself because that would include your machine user name on the prompt.

If inxi is not installed, you can install it with:
sudo apt update
sudo apt install inxi

@guitargirl15 no it did not show wifi icon on top right corner and even it is not showing the wireless settings in network

@Fast-Nop I did "sudo apt install inxi" now what next?

@priyanshu-zeon inxi -Fxxxrz
That will output a bunch of data in the terminal which you can copy/paste. You will have to split that over some comments here because it's more than 1000 characters (3600 on my current machine).

Or make a screenshot and erase your user name from the prompt using some graphics editor before posting that.

@Fast-Nop what do I find now, I just want to connect my mobile wifi with my ubuntu pc?

@priyanshu-zeon Yeah, and it seems that it doesn't work. If you want to troubleshoot, you need to figure out what exactly doesn't work. The first thing is to check how your Ubuntu sees your system.

In particular, does it even recognise your wifi hardware, and does it have a driver loaded. That would be in the "Network" section of the inxi output.

@Fast-Nop In network section it shows driver as N/A

@priyanshu-zeon And what hardware does it show? I'm getting impatient and am not up to asking separately for every bit of information.

Maybe boot Windows and get the name of the WiFi card / adapter from the device manager (devmgmt.msc).

You sure you got wifi Hardware?

@sbiewald actually I totally remove windows in my system and I don't know about my wifi adapter but after some troubleshooting, I think I don't have wifi adapter for "asus tuf gaming f15"

@priyanshu-zeon According to the Windows(!) driver download in Asus' page your notebook has some recent Mediatek Wifi card. According to https://askubuntu.com/questions/... it is a "Mediatek Corp. Device 7961" (mt7921e). It is included since Linux 5.12 (https://lwn.net/Articles/843393).

Ubuntu 20.04 ships 5.4, but has "OEM kernels" which are drastically newer. Even Ubuntu 20.10 and 21.04 only have 5.11.

If you have installed Ubuntu 20.04, you may try to install "linux-oem-20.04c" (or linux-oem-20.04d) + reboot.

@sbiewald after install "linux-oem-20.04c" my wifi works fine but it's speed is really slow compare to ethernet is there any way to improve speed?

@sbiewald and my OS face these problems from time to time -

@priyanshu-zeon
WiFi speed: Well. It's WiFi. I can't diagnose it from here.

The "Ubuntu experienced an internal error" - no idea.

The last picture: To get the full error, run "sudo apt update && sudo apt upgrade" and "sudo snap refresh".