This issue was resolved by the yesterday updates. Today I launched the computer and I could login to normal gnome-session without any problem.
The related update packages could be
gdm_2.96.6-0ubuntu4_i386.deb
gnome-session_2.29.6-0ubuntu4_all.deb
gnome-session-bin_2.29.6-0ubuntu4_all.deb
gtk2-engines-pixbuf_2.19.6-1ubuntu3_i386.deb
No X-related packages were received yesterday, so, very likely the issue was within any of the above packages.
This issue was resolved by the yesterday updates. Today I launched the computer and I could login to normal gnome-session without any problem.
The related update packages could be 6-0ubuntu4_ i386.deb 2.29.6- 0ubuntu4_ all.deb bin_2.29. 6-0ubuntu4_ all.deb pixbuf_ 2.19.6- 1ubuntu3_ i386.deb
gdm_2.96.
gnome-session_
gnome-session-
gtk2-engines-
No X-related packages were received yesterday, so, very likely the issue was within any of the above packages.