As suggested by jolindbe, on Ubuntu 12.04 I've invoked the following command:
gsettings set org.gnome.desktop.background picture-uri 
'file:///usr/share/backgrounds/Precise_Pangolin_by_Vlad_Gerasimov.jpg'

which fixed the issue of corrupted graphics after the user login (for
the user who invoked the command). After several reboots it's still OK.

This could be put in a logout script but I'd say that 
/etc/gdm/PostSession/Default is not a good choice for Ubuntu 12.04 as it uses
lightdm instead of GDM.

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https://bugs.launchpad.net/bugs/931967

Title:
  Corrupted graphics after the login  until the unity launcher appears

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