pybliotext: 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/pybliotext - from package: pybliographer

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