ujconv: 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/ujconv - from package: libunicode-japanese-perl

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

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