XF 1.5 Apache2 Ubuntu default page appears after updating server from Ubuntu 12 to 14

Hello,

I’ve decided to update my forum from XF1.5 to XF2.1.
XF support wrote to me that it is needed to update PHP from 5.5.9 to 5.6 at first.
After approximately two weeks of investigation, I’ve found that to update PHP it is required to update Ubuntu from 14.0 to 16.0 version, at first.
Then I “successfully” updated both Ubuntu and PHP.
I mean, now I have both Ubuntu 16.0 and PHP 5.6, but now I see a default Apache2.0 page instead of my forum.
XF support wrote to me that they do not see an installed license of XF on my web-site.
However, I see that XF files are still present on my server (along with Nginx and its config).

Could anyone please help me to identify a problem with the settings of XF/my server so that my forum will be available again?
 
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