backupcleaner: 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/share/solr/bin/backupcleaner - from package: solr-common

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

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