The most common problem with wireless cards is that they require non-free firmware blobs. These used to be packaged with the kernel but Debian has packaged them separately for the past couple of releases.
The easiest thing you can do is perform the install using a wired network which is much less likely to require non-free firmware. Once the install is complete be sure to install the firmware-linux-nonfree package before trying to use your wireless network. As the name suggests, it is located in the non-free repository which you will need to add to your sources. If installing from a wired network is not an option, try the unoffical installer which includes the non-free firmware. It can be found here: https://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/9.2.1+nonfree/amd64/iso-cd/ Good luck! On 24 October 2017 at 06:41, eamanu15 . <emmanuelaria...@gmail.com> wrote: > Hello, > > I am trying to install Debian 9 (debian-9.2.1-amd64.netinst.iso) using > USB booting method. > > My laptop is a Samsung RV420 - Core i5 - 4GB RAM - 640GB HDD > > The installer detect my two network card (ethernet and wireless). I use > the wireless card. > > I complete the ESSID and password for the wireless network. But (after > complete the password) the installer give the error: > > Attempting to find an available wireless network Failed. > > What could be the problem? > > Regard! > eamanu > -- > Arias Emmanuel > http://eamanu.com >
