dh_installcron: command not found

Have You tried accessing the binary with the full path?

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/dh_installcron - from package: debhelper

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