cinnamon-looking-glass: 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/cinnamon-looking-glass - from package: cinnamon

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

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