automysqlbackup: 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/sbin/automysqlbackup - from package: automysqlbackup

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