simul-landmarks: 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/simul-landmarks - from package: mrpt-apps

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

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