docbook2odf: 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/docbook2odf - from package: docbook2odf

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

Error in other languages:
docbook2odf: bevel nie gevind nie
docbook2odf: comandă negăsită
docbook2odf: comando não encontrado
docbook2odf: commande introuvable
docbook2odf: command not found
docbook2odf: käsku ei ole
docbook2odf: không tìm thấy lệnh
docbook2odf: komanda nerasta
docbook2odf: Kommando nicht gefunden.
docbook2odf: kommandot finns inte
docbook2odf: komut yok
docbook2odf: nie znaleziono polecenia
docbook2odf: níor aimsíodh an t-ordú
docbook2odf: no se encontró la orden
docbook2odf: no s'ha trobat l'ordre
docbook2odf: opdracht niet gevonden
docbook2odf: parancs nem található
docbook2odf: perintah tidak ditemukan
docbook2odf: príkaz nenájdený
docbook2odf: příkaz nenalezen
docbook2odf: команда не найдена
docbook2odf: командата не е открита
docbook2odf: 命令找不到
docbook2odf: コマンドが見つかりません