abw2epub: 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/abw2epub - from package: abw2epub

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

Error in other languages:
abw2epub: bevel nie gevind nie
abw2epub: comandă negăsită
abw2epub: comando não encontrado
abw2epub: commande introuvable
abw2epub: command not found
abw2epub: käsku ei ole
abw2epub: không tìm thấy lệnh
abw2epub: komanda nerasta
abw2epub: Kommando nicht gefunden.
abw2epub: kommandot finns inte
abw2epub: komut yok
abw2epub: nie znaleziono polecenia
abw2epub: níor aimsíodh an t-ordú
abw2epub: no se encontró la orden
abw2epub: no s'ha trobat l'ordre
abw2epub: opdracht niet gevonden
abw2epub: parancs nem található
abw2epub: perintah tidak ditemukan
abw2epub: príkaz nenájdený
abw2epub: příkaz nenalezen
abw2epub: команда не найдена
abw2epub: командата не е открита
abw2epub: 命令找不到
abw2epub: コマンドが見つかりません