ivtext: 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/ivtext - from package: ivtools-bin

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