pcl_grabcut_2d: command not found

Have You tried accessing the binary with the full path?

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/pcl_grabcut_2d - from package: pcl-tools

You may install the required package with command apt-get install {package}
Error in other languages:
pcl_grabcut_2d: bevel nie gevind nie
pcl_grabcut_2d: comandă negăsită
pcl_grabcut_2d: comando não encontrado
pcl_grabcut_2d: commande introuvable
pcl_grabcut_2d: command not found
pcl_grabcut_2d: käsku ei ole
pcl_grabcut_2d: không tìm thấy lệnh
pcl_grabcut_2d: komanda nerasta
pcl_grabcut_2d: Kommando nicht gefunden.
pcl_grabcut_2d: kommandot finns inte
pcl_grabcut_2d: komut yok
pcl_grabcut_2d: nie znaleziono polecenia
pcl_grabcut_2d: níor aimsíodh an t-ordú
pcl_grabcut_2d: no se encontró la orden
pcl_grabcut_2d: no s'ha trobat l'ordre
pcl_grabcut_2d: opdracht niet gevonden
pcl_grabcut_2d: parancs nem található
pcl_grabcut_2d: perintah tidak ditemukan
pcl_grabcut_2d: príkaz nenájdený
pcl_grabcut_2d: příkaz nenalezen
pcl_grabcut_2d: команда не найдена
pcl_grabcut_2d: командата не е открита
pcl_grabcut_2d: 命令找不到
pcl_grabcut_2d: コマンドが見つかりません