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

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

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