dh_installxsp: 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_installxsp - from package: dh-xsp

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

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