celestia-glut: 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/celestia-glut - from package: celestia-glut

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

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