converttops: 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/converttops - from package: leptonica-progs

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

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