connect_wireless: 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/lib/plainbox-providers-1/checkbox/bin/connect_wireless - from package: plainbox-provider-checkbox

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

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