blkmapd: 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/sbin/blkmapd - from package: nfs-common

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

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