modeline2fb: 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:

/bin/modeline2fb - from package: fbset

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

Error in other languages:
modeline2fb: bevel nie gevind nie
modeline2fb: comandă negăsită
modeline2fb: comando não encontrado
modeline2fb: commande introuvable
modeline2fb: command not found
modeline2fb: käsku ei ole
modeline2fb: không tìm thấy lệnh
modeline2fb: komanda nerasta
modeline2fb: Kommando nicht gefunden.
modeline2fb: kommandot finns inte
modeline2fb: komut yok
modeline2fb: nie znaleziono polecenia
modeline2fb: níor aimsíodh an t-ordú
modeline2fb: no se encontró la orden
modeline2fb: no s'ha trobat l'ordre
modeline2fb: opdracht niet gevonden
modeline2fb: parancs nem található
modeline2fb: perintah tidak ditemukan
modeline2fb: príkaz nenájdený
modeline2fb: příkaz nenalezen
modeline2fb: команда не найдена
modeline2fb: командата не е открита
modeline2fb: 命令找不到
modeline2fb: コマンドが見つかりません