invprofcheck: 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/invprofcheck - from package: argyll

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