ansel-garbage-collection: 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/ansel-garbage-collection - from package: php-horde-ansel

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

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