fastaq_expand_nucleotides: 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_expand_nucleotides - from package: fastaq

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

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