ebook2cwgui: 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/ebook2cwgui - from package: ebook2cwgui

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

Error in other languages:
ebook2cwgui: bevel nie gevind nie
ebook2cwgui: comandă negăsită
ebook2cwgui: comando não encontrado
ebook2cwgui: commande introuvable
ebook2cwgui: command not found
ebook2cwgui: käsku ei ole
ebook2cwgui: không tìm thấy lệnh
ebook2cwgui: komanda nerasta
ebook2cwgui: Kommando nicht gefunden.
ebook2cwgui: kommandot finns inte
ebook2cwgui: komut yok
ebook2cwgui: nie znaleziono polecenia
ebook2cwgui: níor aimsíodh an t-ordú
ebook2cwgui: no se encontró la orden
ebook2cwgui: no s'ha trobat l'ordre
ebook2cwgui: opdracht niet gevonden
ebook2cwgui: parancs nem található
ebook2cwgui: perintah tidak ditemukan
ebook2cwgui: príkaz nenájdený
ebook2cwgui: příkaz nenalezen
ebook2cwgui: команда не найдена
ebook2cwgui: командата не е открита
ebook2cwgui: 命令找不到
ebook2cwgui: コマンドが見つかりません