OK, the problem seems to be solved. THANKS A LOT, Deepak !!!!!!!!!!
The root cause is, that MaxDB 7.5 is VERY VERY VERY BUGGY !!!
It simply wouldn't start !!! As I don't know nothing about MaxDB, it took me a lot to find it out.
On an attempt to be started, it would produce the following error:
ERR
-24994,ERR_RTE: runtime environment error
1,Check knldiag! Kernel died before reaching ADMIN state
though no knldiag file was generated.
The final solution comes partly from Note 790879 - SAP Web AS 6.40 SR1 Installation on UNIX: MaxDB , which really inspired me to the solution.
Though, they say: Install MaxDB database software 7.5 build 25 or higher. I have build 32 and STILL it wouldn't start !!
Now I took MaxDB 7.6 (I think from the installation of NetWeaver 7.0) and at least I could pass the fatal step #14 ;-) And contrary to what the note says, I had to start from scratch again, as I couldn't resume the previous installation. Now the DB is being loaded, let's see... Wish me luck ;-)