Also while messing with the terminal, an auto generated mail went to the root folder saying
Subject: *** SECURITY information for baikal ***
baikal : Feb 10 07:34:20 : www-data : user NOT in sudoers ; TTY=unknown ;$
From www-data@baikal Fri Feb 10 07:35:24 2017
Return-Path:
Received: from baikal (baikal [127.0.0.1])
by baikal (8.15.2/8.15.2/Debian-3) with ESMTP id v1A7ZOC3017405
for ; Fri, 10 Feb 2017 07:35:24 GMT
Received: (from www-data@localhost)
by baikal (8.15.2/8.15.2/Submit) id v1A7ZOLM017255;
Fri, 10 Feb 2017 07:35:24 GMT
Date: Fri, 10 Feb 2017 07:35:24 GMT
Message-Id: <201702100735.v1A7ZOLM017255@baikal>
To: root@baikal
From: www-data@baikal
Auto-Submitted: auto-generated
Subject: *** SECURITY information for baikal ***
baikal : Feb 10 07:34:24 : www-data : user NOT in sudoers ; TTY=unknown ;$
Don't worry about the mail part. It is the mail service of Ubuntu, which sends a mail to your own device if you log in, or you encounter an error, or security issue, etc.
Usually it is just bullshit.