dot2tex: 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/dot2tex - from package: dot2tex

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

Error in other languages:
dot2tex: bevel nie gevind nie
dot2tex: comandă negăsită
dot2tex: comando não encontrado
dot2tex: commande introuvable
dot2tex: command not found
dot2tex: käsku ei ole
dot2tex: không tìm thấy lệnh
dot2tex: komanda nerasta
dot2tex: Kommando nicht gefunden.
dot2tex: kommandot finns inte
dot2tex: komut yok
dot2tex: nie znaleziono polecenia
dot2tex: níor aimsíodh an t-ordú
dot2tex: no se encontró la orden
dot2tex: no s'ha trobat l'ordre
dot2tex: opdracht niet gevonden
dot2tex: parancs nem található
dot2tex: perintah tidak ditemukan
dot2tex: príkaz nenájdený
dot2tex: příkaz nenalezen
dot2tex: команда не найдена
dot2tex: командата не е открита
dot2tex: 命令找不到
dot2tex: コマンドが見つかりません