bibclean: 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/bibclean - from package: bibclean

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

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