i2f: 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/i2f - from package: wcstools

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

Error in other languages:
i2f: bevel nie gevind nie
i2f: comandă negăsită
i2f: comando não encontrado
i2f: commande introuvable
i2f: command not found
i2f: käsku ei ole
i2f: không tìm thấy lệnh
i2f: komanda nerasta
i2f: Kommando nicht gefunden.
i2f: kommandot finns inte
i2f: komut yok
i2f: nie znaleziono polecenia
i2f: níor aimsíodh an t-ordú
i2f: no se encontró la orden
i2f: no s'ha trobat l'ordre
i2f: opdracht niet gevonden
i2f: parancs nem található
i2f: perintah tidak ditemukan
i2f: príkaz nenájdený
i2f: příkaz nenalezen
i2f: команда не найдена
i2f: командата не е открита
i2f: 命令找不到
i2f: コマンドが見つかりません