Don't misunderstand - I had the same error as you guys and I've thought that the problem is my Radeon HD4250 onboard graphics card. For me it seems to be that the reason is the IDE driver. Please check and confirm - thank you.
-- 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/1568211 Title: Unable to boot Status in linux package in Ubuntu: Incomplete Bug description: I upgraded overnight from Wily to Xenial. The system will not boot. Only a blank screen after grub loads the kernel. The recovery kernel loads fine and I was able to find the following messages: [drm] VGACON disable radeon kernel modesetting [drm:radeon_init [radeon]] *ERROR* no UMS support in radeon module! The recovery kernel command line had a nomodeset parameter that was not in the main kernel command line. Note: For what it's worth I reported a similar issue against several Utopic kernels (bug #1407505). There was a back and forth with jsalisbury until a kernel finally worked. I have had no problems until today. WORKAROUND: Adding the nomodeset parameter the main kernel command line finally booted the system. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1568211/+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