uwsgi_python27: 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/uwsgi_python27 - from package: uwsgi-plugin-python

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

Error in other languages:
uwsgi_python27: bevel nie gevind nie
uwsgi_python27: comandă negăsită
uwsgi_python27: comando não encontrado
uwsgi_python27: commande introuvable
uwsgi_python27: command not found
uwsgi_python27: käsku ei ole
uwsgi_python27: không tìm thấy lệnh
uwsgi_python27: komanda nerasta
uwsgi_python27: Kommando nicht gefunden.
uwsgi_python27: kommandot finns inte
uwsgi_python27: komut yok
uwsgi_python27: nie znaleziono polecenia
uwsgi_python27: níor aimsíodh an t-ordú
uwsgi_python27: no se encontró la orden
uwsgi_python27: no s'ha trobat l'ordre
uwsgi_python27: opdracht niet gevonden
uwsgi_python27: parancs nem található
uwsgi_python27: perintah tidak ditemukan
uwsgi_python27: príkaz nenájdený
uwsgi_python27: příkaz nenalezen
uwsgi_python27: команда не найдена
uwsgi_python27: командата не е открита
uwsgi_python27: 命令找不到
uwsgi_python27: コマンドが見つかりません