latexdef: 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/latexdef - from package: texlive-extra-utils

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

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