gnome-osd-event-bridge: 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/gnome-osd-event-bridge - from package: gnome-osd

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

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