gjs-console: 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/gjs-console - from package: gjs

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

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