debconf-escape: 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/debconf-escape - from package: debconf

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

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