gtkspu: 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/gtkspu - from package: gopchop

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

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