signcontrol: 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/news/bin/signcontrol - from package: inn2

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

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