boobooks: 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/boobooks - from package: weboob

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

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