ceilometer-collector: 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/ceilometer-collector - from package: ceilometer-collector

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

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