doc2odt: command not found

Have You tried accessing the binary with the full path?

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/doc2odt - from package: unoconv

You may install the required package with command apt-get install {package}
Error in other languages:
doc2odt: bevel nie gevind nie
doc2odt: comandă negăsită
doc2odt: comando não encontrado
doc2odt: commande introuvable
doc2odt: command not found
doc2odt: käsku ei ole
doc2odt: không tìm thấy lệnh
doc2odt: komanda nerasta
doc2odt: Kommando nicht gefunden.
doc2odt: kommandot finns inte
doc2odt: komut yok
doc2odt: nie znaleziono polecenia
doc2odt: níor aimsíodh an t-ordú
doc2odt: no se encontró la orden
doc2odt: no s'ha trobat l'ordre
doc2odt: opdracht niet gevonden
doc2odt: parancs nem található
doc2odt: perintah tidak ditemukan
doc2odt: príkaz nenájdený
doc2odt: příkaz nenalezen
doc2odt: команда не найдена
doc2odt: командата не е открита
doc2odt: 命令找不到
doc2odt: コマンドが見つかりません