pcmanx: 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/pcmanx - from package: pcmanx-gtk2

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