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[ubuntu] Can't boot into system after dist-upgrade to 3.2.0-33 linux

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http://ubuntuforums.org – I did a 'sudo apt-get dist-upgrade' a couple of weeks ago in Ubuntu 12.04 and was no longer able to boot into my system (Dell XPS 15z), getting the following error on a black screen that doesn't go anywhere: Code: [drm:intel_dsm_platform_mux_info] *ERROR* MUX INFO call failed [drm:intel_dsm_platform_mux_info] *ERROR* MUX INFO call failed On the grub boot screen I was able to select 'Previous Linux versions' and boot with 3.2.0-32 successfully. After the latest upgrade (today) to 3.2.0-34, I thought the problem might have been fixed, but it gives the same error upon startup. But booting (Hardware)