apoconv: 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/apoconv - from package: scmxx

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