cecilia: command not found

Have You tried accessing the binary with the full path?

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/cecilia - from package: cecilia

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