dlda-landscape: 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/dlda-landscape - from package: python-mlpy

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

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