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I had set the boot preference to USB drive on my desktop which was running on Ubuntu 13.04. Yesterday I plugged in a USB and on switching on the comp it started to boot from the USB drive. When I saw that I immediately pulled the USB out (my bad!) and the comp was stuck. But when I re started it, it booted normally but gets stuck on the login screen. The OS does not recognize either the keyboard nor the mouse. I tried using Boot Repair but that did not help. The link that Boot Repair provided me is My system is also running Win8 and it doesn't have any problem. Its urgent that I fix it soon so any help would be much appreciated!

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up vote 1 down vote accepted

It must be an issue with a broken Kernel image. Just log into command-line/Terminal and run sudo apt-get install --reinstall linux-image-generic linux-image

See if the issue is fixed after a reboot.

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Well I figured out the problem. During the broken boot my kernel Linux 3.8.0-29 generic had become corrupt. When I tried booting from an older version of the Linux kernel, it booted up normally. So now I just have to re install the broken kernel!

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sudo apt-get install --reinstall linux-image-generic linux-image – Joren Sep 17 '13 at 14:16

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