uwsgi_graylog2: 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_graylog2 - from package: uwsgi-plugin-graylog2

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

Error in other languages:
uwsgi_graylog2: bevel nie gevind nie
uwsgi_graylog2: comandă negăsită
uwsgi_graylog2: comando não encontrado
uwsgi_graylog2: commande introuvable
uwsgi_graylog2: command not found
uwsgi_graylog2: käsku ei ole
uwsgi_graylog2: không tìm thấy lệnh
uwsgi_graylog2: komanda nerasta
uwsgi_graylog2: Kommando nicht gefunden.
uwsgi_graylog2: kommandot finns inte
uwsgi_graylog2: komut yok
uwsgi_graylog2: nie znaleziono polecenia
uwsgi_graylog2: níor aimsíodh an t-ordú
uwsgi_graylog2: no se encontró la orden
uwsgi_graylog2: no s'ha trobat l'ordre
uwsgi_graylog2: opdracht niet gevonden
uwsgi_graylog2: parancs nem található
uwsgi_graylog2: perintah tidak ditemukan
uwsgi_graylog2: príkaz nenájdený
uwsgi_graylog2: příkaz nenalezen
uwsgi_graylog2: команда не найдена
uwsgi_graylog2: командата не е открита
uwsgi_graylog2: 命令找不到
uwsgi_graylog2: コマンドが見つかりません