start_parallel_jobs.py: 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
/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/lib/qiime/bin/start_parallel_jobs.py - from package: qiime

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