odt2xhtml: 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/odt2xhtml - from package: unoconv

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

Error in other languages:
odt2xhtml: bevel nie gevind nie
odt2xhtml: comandă negăsită
odt2xhtml: comando não encontrado
odt2xhtml: commande introuvable
odt2xhtml: command not found
odt2xhtml: käsku ei ole
odt2xhtml: không tìm thấy lệnh
odt2xhtml: komanda nerasta
odt2xhtml: Kommando nicht gefunden.
odt2xhtml: kommandot finns inte
odt2xhtml: komut yok
odt2xhtml: nie znaleziono polecenia
odt2xhtml: níor aimsíodh an t-ordú
odt2xhtml: no se encontró la orden
odt2xhtml: no s'ha trobat l'ordre
odt2xhtml: opdracht niet gevonden
odt2xhtml: parancs nem található
odt2xhtml: perintah tidak ditemukan
odt2xhtml: príkaz nenájdený
odt2xhtml: příkaz nenalezen
odt2xhtml: команда не найдена
odt2xhtml: командата не е открита
odt2xhtml: 命令找不到
odt2xhtml: コマンドが見つかりません