pma-secure: 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/sbin/pma-secure - from package: phpmyadmin

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

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