nccnavi: 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/nccnavi - from package: ncc

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

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