controlchan: 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/controlchan - from package: inn2
/usr/lib/news/bin/controlchan - from package: inn

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

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