gcheck: 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/lib/voxbo/bin/gcheck - from package: voxbo

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

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