qutemol: 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/qutemol - from package: qutemol

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

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