average_genome_size: 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/average_genome_size - from package: grinder

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

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