dh_installinfo: 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/dh_installinfo - from package: debhelper

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

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