Error while trying to install AMD drivers

Error while trying to install AMD drivers

I was following the instructions on section 3.2 of this page.
Everything went well until step 8, which is to use sudo amdconfig
--initial to create a new xorg.conf file, but I get the following error:
amdconfig: error while loading shared libraries: libGL.so.1: wrong ELF
class: ELFCLASS32
I tried creating the file /etc/ld.so.conf.d/lib32.conf with /usr/lib32
inside, as the second answer here suggested, and ran sudo ldconfig but
nothing changed.
EDIT: Installed libgl1-mesa-glx:i386 and ran sudo ldconfig, and problem
persisted even after rebooting.
EDIT2: Since step seven of the first link, after rebooting my top and side
panels of unity and also the dash are missing, but I'm assuming this will
be fixed when I finish the drivers instalation.
EDIT3: Same error happens with fglrx command.