flipbook: 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/flipbook - from package: ivtools-bin

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

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