fastaq_deinterleave: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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_deinterleave - from package: fastaq

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