lftpget: 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 CentOS possible default full paths are:

/usr/bin/lftpget - from package: lftp

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/lftpget - from package: lftp

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

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