Hi;
I have a lenovo thinkpad x1 carbon with windows 8 as default OS and I have installed ubuntu 14.04 alongside it. But in startup when I select windows boot manager, doesn't any action and show startup menu again. Ubuntu works without any problem.
Please help me;
Thanks

More information will be needed and the simplest way for you to get it to post here is to boot Ubuntu, open your web browser and go to the site below. Read the instructions from the link in the Description box at that site, then download and run the bootinfoscript and post the output, a results.txt file. It will show details on your drives/partitions, boot files and other related information which should help resolve the issue.

http://sourceforge.net/projects/bootinfoscript/

Result of bootinfo script :

RESULTS.txt

You are using uefi rather than mbr boot. I'm not familiar with uefi so have no advice in that regard. If you look at the output below from the bootinfoscript, you can see only an EFI System Partition (sda), a Linux data partition (sda2) which is Ubuntu and the swap on sda3. So you appear to have overwritten your windows installation. Ubuntu gives several options to install and the best one to select is called 'Something Else' which gives you control. There are numerous tutorials online on installing Ubuntu with windows 8. I've not used windows 8 so can't advise but reading some tutorials and reading on uefi systems would be a starting point. Hopefully, you have a windows 8 installation disk.