create_db.mysql: 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/share/sympa/bin/create_db.mysql - from package: sympa

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

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