I developed a Joomla 3.6 site deployed on local host. It was working absolutely fine. However, the site is completely broken after uploading to the remote host(http://polluscope.uvsq.fr/Polluscope/). I am guessing some extensions are missing. But any suggestions would be highly appreciated.
Is the link (path to your site) correct? You have a folder under a subdomain, i thought that was strange so i checked just the subdomain http://polluscope.uvsq.fr there was the restore steps from Akeba and after clicking start over the site worked (the site that you can see now in my link appeared) is that your site?
The errors are almost all 403 Forbidden which is probably caused by your .htaccess file. To verify, you can temporarily remove the .htaccess from the root of your site via FTP and see if those resources load without it.
You can either revert to the default Joomla htaccess (rename htaccess.txt) or if you are using the master htaccess by Nicholas K. Dionysopoulos, make sure you go through and do a find/replace for all instances of example.com and example/.com as that is what allows exceptions for your domain name. https://github.com/nikosdion/master-htaccess/blob/master/htaccess.txt
How did you upload your website? Did you copy all files via ftp and import a database dump or did you use a backup extension?
Did you realy use Joomal! Version 2.5? This version is not supported any more: https://downloads.joomla.org/de/cms/joomla25/2-5-28