switchconf: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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/sbin/switchconf - from package: switchconf

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