PROBLEM SOLVED: I change the title accordingly.
Is there any troubleshooting guide to update?
EDIT: I changed the first post content too, so it is easier to solve this issue.It works!
"finalizing tileset etc.!" perfect!
There is something strange with my desktop environment (I cannot minimize windows...) but it works! (any help?

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Thank you so much romovs for the suggestion and in general all of you gals/guys for the consideration!
Here's what I did.
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As a test:
> glxinfo
"glxinfo: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory"
Then I followed the guides here:
https://wiki.debian.org/ATIProprietary# ... ary_Driverhttps://wiki.debian.org/ATIProprietary#wheezy (for my particular version of Debian)
https://wiki.debian.org/ATIProprietary#configureAfter the restart, your desktop environment could change considerably.
Run "autohaven". A sort of will o' wisp appears.
