gkdebconf-term: 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/gkdebconf-term - from package: gkdebconf

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

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