qgle: 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/qgle - from package: gle-graphics

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

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