fastaq_chunker: 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/fastaq_chunker - from package: fastaq

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

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