bcrontab: command not found

Have You tried accessing the binary with the full path?

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/bcrontab - from package: bcron

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