libgl1-mesa-dri contains many dri drivers in it (including both intel and radeon ones), nouveau is contained in libgl1-mesa-dri-experiemental which is why it's not a dependency for libgl1-mesa-dri.
** Changed in: mesa (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in ubuntu. https://bugs.launchpad.net/bugs/689077 Title: libgl1-mesa-dri depend libdrm-radeon1 AND libdrm-intel1 on my ATI r300 _______________________________________________ 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