I was installing Debian. But, I know that I have installed wireless connection system manually in Debian.
[![enter image description here][1]][1]
But, I couldn't install wireless connection while installing Debian. I had connected Ethernet although, I couldn't install it. So, I had skipped it. I downloaded `iwlwifi-6000g2a-ucode-18.168.6.1.tgz` from [Intel Wireless connection](https://www.intel.com/content/www/us/en/support/articles/000005511/wireless.html). I had tried to some commands also
```bash
apt-get install linux-firmware
apt-get install firmware-iwlwifi
```
Both had returned "unable to locate package". When I had extracted `wlwifi-6000g2a-ucode-18.168.6.1.tgz`, I just found three files. I don't think that I can do something with them. So, how can I install wireless network in Debian.
[![enter image description here][2]][2]
I had made changes to `/etc/apt/sources.list`
```
#
# deb cdrom:[Debian GNU/Linux 10.10.0 _Buster_ - Official amd64 NETINST 20210619-16:11]/ buster main
#deb cdrom:[Debian GNU/Linux 10.10.0 _Buster_ - Official amd64 NETINST 20210619-16:11]/ buster main
deb http://deb.debian.org/debian/ buster main contrib non-free
deb-src http://deb.debian.org/debian/ buster main contrib non-free
deb http://security.debian.org/debian-security buster/updates main contrib non-free
deb-src http://security.debian.org/debian-security buster/updates main contrib non-free
# buster-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ buster-updates main contrib non-free
deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
```
```
root@Istiak:/home/istiak# lspci | grep -i network
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
```
[1]: https://i.stack.imgur.com/q66Jd.jpg
[2]: https://i.stack.imgur.com/YBog4.png
