cutsel: 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/cutsel - from package: autocutsel

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

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