extract_fastq: 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/extract_fastq - from package: staden-io-lib-utils

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

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