nxconvert: 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/nxconvert - from package: nexus-tools

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

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