netselect: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/netselect - from package: netselect

You may install the required package with command apt-get install {package}

Error in other languages:
netselect: bevel nie gevind nie
netselect: comandă negăsită
netselect: comando não encontrado
netselect: commande introuvable
netselect: command not found
netselect: käsku ei ole
netselect: không tìm thấy lệnh
netselect: komanda nerasta
netselect: Kommando nicht gefunden.
netselect: kommandot finns inte
netselect: komut yok
netselect: nie znaleziono polecenia
netselect: níor aimsíodh an t-ordú
netselect: no se encontró la orden
netselect: no s'ha trobat l'ordre
netselect: opdracht niet gevonden
netselect: parancs nem található
netselect: perintah tidak ditemukan
netselect: príkaz nenájdený
netselect: příkaz nenalezen
netselect: команда не найдена
netselect: командата не е открита
netselect: 命令找不到
netselect: コマンドが見つかりません