adequate: 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/adequate - from package: adequate

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

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