qct: 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/qct - from package: qct

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

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