utf8: 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/utf8 - from package: fonty-rg

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

Error in other languages:
utf8: bevel nie gevind nie
utf8: comandă negăsită
utf8: comando não encontrado
utf8: commande introuvable
utf8: command not found
utf8: käsku ei ole
utf8: không tìm thấy lệnh
utf8: komanda nerasta
utf8: Kommando nicht gefunden.
utf8: kommandot finns inte
utf8: komut yok
utf8: nie znaleziono polecenia
utf8: níor aimsíodh an t-ordú
utf8: no se encontró la orden
utf8: no s'ha trobat l'ordre
utf8: opdracht niet gevonden
utf8: parancs nem található
utf8: perintah tidak ditemukan
utf8: príkaz nenájdený
utf8: příkaz nenalezen
utf8: команда не найдена
utf8: командата не е открита
utf8: 命令找不到
utf8: コマンドが見つかりません