The reason for the black screen is that Ubuntu can't get into the system after updating the system

First, Ubuntu 14.04 upgrade the kernel after the restart of the black screen to solve this article from the Linux Commune website (www.linuxidc.com) original link: http://www.linuxidc.com/Linux/2014-09/106813.htm

At work today, software Updater prompted a software update, checked some packages and let it update themselves in the background. Later in the evening to restart the next time to enter Ubuntu 14.04 when the start of a graphical interface on the black screen, is very anxious, has not encountered before. Even a heavy load of heart, but if the reload will waste a lot of time.


Ubuntu 14.04 Kernel upgrade detailed steps http://www.linuxidc.com/Linux/2014-05/101240.htm


Later see in Ubuntu there is a startup mode selection:


Ubuntu 14.04 After upgrading the kernel reboot black screen solution


After entering, there are 3 kernel versions to choose from:


Ubuntu, with Linux 3.13.0-24-generic
Ubuntu, with Linux 3.13.0-24-generic (recovery mode)
Ubuntu, with Linux 3.13.0-30-generic
Ubuntu, with Linux 3.13.0-30-generic (recovery mode)
Ubuntu, with Linux 3.13.0-32-generic
Ubuntu, with Linux 3.13.0-32-generic (recovery mode)


I tried from the high version to the lower version, and finally I chose vmlinuz-3.13.0-24-generic to start it normally. Later the search forum someone said that because the upgrade of the kernel kernel upgrade will cause the video card is incompatible, and then again into the high version of the kernel command line mode in accordance with: m.oschina.net/blog/227134 the way to reinstall the driver, but prompted


0 upgraded, 0 newly installed, 0 to remove


It seems that the high version of the kernel is temporarily unable to repair, if every time to enter Ubuntu to choose the kernel is very troublesome, but had to unload the high version of the kernel:


First view the current kernel version with uname-a.


$ uname-a
Linux xianjian-lenovo-m490 3.13.0-24-generic #47-ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 gnu/linux


and then use


$ dpkg--get-selections|grep Linux


View the currently installed kernel.


Then uninstall the kernel version that is not available:


sudo apt-get remove linux-image-3.13.0-xx-generic


Ubuntu 14.04 Download, installation, configuration and related knowledge http://www.linuxidc.com/Linux/2014-04/100370.htm


Ubuntu 14.04 System Download Address: http://www.linuxidc.com/Linux/2014-04/100352.htm


Windows 7 Hard Drive install Ubuntu 14.04 Graphics Tutorial http://www.linuxidc.com/Linux/2014-04/100369.htm


More Ubuntu related information see Ubuntu topic page http://www.linuxidc.com/topicnews.aspx?tid=2


This article permanently updates the link address: http://www.linuxidc.com/Linux/2014-09/106813.htm


This article comes from the Linux commune website (www.linuxidc.com) original link: http://www.linuxidc.com/Linux/2014-09/106813.htm

Two

The problem has been solved.
Re-add the Ubuntu startup item that was added before Windows is deleted with EASYBCD, and reboot to select Ubuntu. Grub appears to have not been compromised, so there is no fix for grub.

Although the problem is solved, but still do not understand how the problem arises, why use this method to solve.

In addition to the relationship between grub and MBR, I do not understand, when installing Ubuntu, in order to avoid Ubuntu booting windows, in the "Install boot loader device" option, select the location of the/boot partition, the following figure: