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I had mentioned in [the comment](https://linux.codidact.com/comments/thread/3384#comment-11119),
>@Canina‭ I had updated my system also.
But, actually I had updated my system before making changes to `/etc/apt/sources.list`.
<hr/>
At first, you have make some changes to `/etc/apt/sources.list`. You have to add following line to every line which starts with `deb` (in `/etc/apt/sources`).
```bash
contrib non-free
```
Then, you have to update your system.
```
sudo apt-get update && apt-get upgrade
```
~~Then, install `firmware-iwlwifi`. (Your default user won't be sudoers, that's why you have to work as a root user `su`)~~
```
apt-get install firmware-iwlwifi
```
Then, you will have to reboot your PC.

I had mentioned in [the comment](https://linux.codidact.com/comments/thread/3384#comment-11119),
>@Canina‭ I had updated my system also.
But, actually I had updated my system before making changes to `/etc/apt/sources.list`.
<hr/>
You have to work as a root user, so use `sudo` or, if your user is not in the `sudoers` file yet, use `su`.
At first, you have make some changes to `/etc/apt/sources.list`. You have to add following line to every line which starts with `deb` (in `/etc/apt/sources`).
```bash
contrib non-free
```
Then, you have to update your system.
```
apt-get update && apt-get upgrade
```
Then, install `firmware-iwlwifi`.
```
apt-get install firmware-iwlwifi
```
Then, you will have to reboot your PC.