This bug is missing log files that will aid in diagnosing the problem. >From a terminal window please run:
apport-collect 1525615 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1525615 Title: Ubuntu not booting on iMac 5K with ACPI enabled Status in linux package in Ubuntu: Incomplete Bug description: With a 27in 5k ( new as of two weeks ago) I'm unable to boot the kernel without parameter "acpi=off:", it also needs "nomodeset" into order to get a working system. The applies to both the live installer and a system installed on disk. With out the parameters I just get a blank screen. It gives a blank screen event if the "quiet" is removed from the kernel parameters. The system has a 250G SSD. I'm using the Kubutu live installer for Wily off a USB stick. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1525615/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp