deltablast: 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/deltablast - from package: ncbi-blast+

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

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