pspresent: 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/pspresent - from package: pspresent

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

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