some_modes: 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/some_modes - from package: videogen

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

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