gqkillq: 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/gqkillq - from package: ctn

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

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