I've tested this a bit more. The issue is a lot more serious than I thought!
The workaround provided by the bug reporter probably works for computers using an NVIDIA card. And my fix would probably work too. However, for computers with Hybrid graphics/NVIDIA Optimus (Intel+NDIVIA), like my laptop, the workaround has terrible consequences: If I add both lines to alt_ld.so.conf, Unity WON'T START when I login (I get the desktop without Unity). If I add only the "lib32" line to it, Unity starts and I can start Skype and Steam, but I get errors, at least in Steam, about missing things in display :0 or :0.0 and other types of errors. But if I start steam with optirun (I use bumblebee), Steam starts fine. So, the NVIDIA libGL.so.1 version is for NVIDIA graphics ONLY. People like me who use Hybrid Graphics, and Intel card by default, have to use the Mesa version of the library. To fix this execute: $ sudo update-alternatives --config i386-linux-gnu_gl_conf and select the option that contains "mesa". Then run "sudo ldconfig". This issue should definitely be looked into by more experienced people! -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/1181651 Title: ldconfig problem with 64-bit nvidia driver packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/1181651/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp