# After instalation, boot error message: can not find any operational system

After a clean installation of Elementary Loki, there is an error message during the booting that does not allow me run Elementary. "Cannot find any operational system". As I am not an expert, the only solution I found was change Legacy instead of UEFI inside the BIOS, and wallah! is working now.

However, although is working now I suppose something is wrong with my GRUB and I should fix it to be able to boot Elementary with UEFI. I would really appreciate any orientation about how to fix it.

This question it was already posted here Force UEFI installation? but unfortunately did not find a real solution.

*Some additional information: Elementary is the only OS I'm running in my laptop right now. However, previously the laptop was using Windows 10 that came in for default. My laptop is a Sony Vaio, S series.

• There is already a similar question around. elementaryos.stackexchange.com/questions/5345/… . I haven't flagged your question as duplicated because I like your exposition. If you read it and it's helpful please let me know so I can report it as duplicated. – Jorge R. Marín Nov 12 '16 at 16:12
• Before doing anything on that link check if you are using a GPT partition table. Because if you aren't, you'll have to install everything again. sudo parted -l | grep Partition – Maccer Nov 13 '16 at 10:56
• Hmm i think that is not the problem with our OS i think its problem with your method . Can u please explain the method that you used for clean boot please explain your boot procedure . We can help you out soon please reply soon waiting for your reply. – gauthamkrishnanp Nov 14 '16 at 14:12

• After finish, reboot to the system. Check if your installation is in UEFI mode using this command: sudo efibootmgr