ltscompare: 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/ltscompare - from package: mcrl2

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

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