ldo65: 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/ldo65 - from package: xa

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

On Debian possible default full paths are:

/usr/bin/ldo65 - from package: xa65

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

Error in other languages:
ldo65: bevel nie gevind nie
ldo65: comandă negăsită
ldo65: comando não encontrado
ldo65: commande introuvable
ldo65: command not found
ldo65: käsku ei ole
ldo65: không tìm thấy lệnh
ldo65: komanda nerasta
ldo65: Kommando nicht gefunden.
ldo65: kommandot finns inte
ldo65: komut yok
ldo65: nie znaleziono polecenia
ldo65: níor aimsíodh an t-ordú
ldo65: no se encontró la orden
ldo65: no s'ha trobat l'ordre
ldo65: opdracht niet gevonden
ldo65: parancs nem található
ldo65: perintah tidak ditemukan
ldo65: príkaz nenájdený
ldo65: příkaz nenalezen
ldo65: команда не найдена
ldo65: командата не е открита
ldo65: 命令找不到
ldo65: コマンドが見つかりません