con2fbmap: 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/con2fbmap - from package: fbset

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

Error in other languages:
con2fbmap: bevel nie gevind nie
con2fbmap: comandă negăsită
con2fbmap: comando não encontrado
con2fbmap: commande introuvable
con2fbmap: command not found
con2fbmap: käsku ei ole
con2fbmap: không tìm thấy lệnh
con2fbmap: komanda nerasta
con2fbmap: Kommando nicht gefunden.
con2fbmap: kommandot finns inte
con2fbmap: komut yok
con2fbmap: nie znaleziono polecenia
con2fbmap: níor aimsíodh an t-ordú
con2fbmap: no se encontró la orden
con2fbmap: no s'ha trobat l'ordre
con2fbmap: opdracht niet gevonden
con2fbmap: parancs nem található
con2fbmap: perintah tidak ditemukan
con2fbmap: príkaz nenájdený
con2fbmap: příkaz nenalezen
con2fbmap: команда не найдена
con2fbmap: командата не е открита
con2fbmap: 命令找不到
con2fbmap: コマンドが見つかりません