cp2k: 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/cp2k - from package: cp2k

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

Error in other languages:
cp2k: bevel nie gevind nie
cp2k: comandă negăsită
cp2k: comando não encontrado
cp2k: commande introuvable
cp2k: command not found
cp2k: käsku ei ole
cp2k: không tìm thấy lệnh
cp2k: komanda nerasta
cp2k: Kommando nicht gefunden.
cp2k: kommandot finns inte
cp2k: komut yok
cp2k: nie znaleziono polecenia
cp2k: níor aimsíodh an t-ordú
cp2k: no se encontró la orden
cp2k: no s'ha trobat l'ordre
cp2k: opdracht niet gevonden
cp2k: parancs nem található
cp2k: perintah tidak ditemukan
cp2k: príkaz nenájdený
cp2k: příkaz nenalezen
cp2k: команда не найдена
cp2k: командата не е открита
cp2k: 命令找不到
cp2k: コマンドが見つかりません