lxclipboard: 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/lxclipboard - from package: lxsession

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

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