quickplot_shell: 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/quickplot_shell - from package: quickplot

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