A have installed Mediawiki successfully and also I was able to place a logo of my own. But the lettering '$wgLogo' appears on the left upper corner of the website and this lettering is only partially covered by the inserted logo. I have searched for the solution quite a lot of time in the Wikimedia manual and the FAQ, but I did not find any hint to solve the problem, i. e. make disappear the lettering '$wgLogo' from my website.
Topic on Project:Support desk
By any chance is that a public wiki so one could take a look?
Most likely this is some kind of coding error in LocalSettings.php...