uniconv: 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/uniconv - from package: yudit

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

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