Due to Clean Url issue, the site is not working I have downloaded Drupal 8 from official site.But during installation it shows following error:
  

but i continue installation, and it installed properly. The problem is that except home page whenever i click on any link it shows "Page Not Found".

I have enabled mod_rewrite for apache . Also i uncomment and edit "RewriteBase/d8" in.htaccess file.

I tried all whatever i found on drupal.org but nothing work for me.I desperate to work in d8 but helpless to continue.
Million of Thanks in advance.
I was having the same problem, I opened the /etc/apache2/apache2.conf file and located this portion of the file

&lt;Directory /var/www/&gt;
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
&lt;/Directory&gt;


And found that AllowOverride is set to None. Go ahead and replace it with All.

Restart your apache service when done. Similar question is asked here