ntptrace: 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 CentOS possible default full paths are:

/usr/sbin/ntptrace - from package: ntp-perl

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ntptrace - from package: ntp

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

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