generate_test_clusters: 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/generate_test_clusters - from package: dnaclust

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

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