Installation did run without problems.
Executing >>quartus from the ~/altera/15.1/quartus/bin folder has no effect whatsoever, no error is printed on the command line.
Adding the above path to $PATH has no effect.
Running >>quartus 2> quartus.stderr to redirect stderr to a file uncovers the following error:

>>cat quartus.stderr
>quartus: error while loading shared libraries: libpng12.so.0: cannot open shared >object file: No such file or directory”

Aha, so a file is missing, why can’t quartus just tell me this?

>>sudo dnf search libpng12
>…
>libpng12.i686 : Old version of libpng, needed to run old binaries
>libpng12.x86_64 : Old version of libpng, needed to run old binaries
>libpng12-devel.i686 : Development files for libpng 1.2
>libpng12-devel.x86_64 : Development files for libpng12
>…

>>sudo dnf install libpng12
>…
>Complete!

Ok let’s try again…

>>quartus

Finally, it works.