pbesinfo: 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/pbesinfo - from package: mcrl2

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

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