perlpanel: 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/perlpanel - from package: perlpanel

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