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