dbconfig-load-include: 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/dbconfig-load-include - from package: dbconfig-common

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

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