bleachbit: 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/bleachbit - from package: bleachbit

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

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