blktool: command not found

Have You tried accessing the binary with the full path?

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/blktool - from package: blktool

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