Boot problem on Latitude E6410

Hi, I have a problem booting my Latitude, I turn it on and wait for the operating system to start, but nothing appears. I have to go to the boot options (it takes two minutes for the menu to appear), and then from there enter the BIOS to set the Integrated NIC option to Enabled instead of Enabled (with PXE boot), because if it does I leave it with PXE boot, it doesn't start. Then, I go back to the boot options (two more minutes), and then select Ubuntu (I use Ubuntu), I hit the Enter key, and sometimes a text appears that says "Faild to open \EFI\ubuntu - Not Found", and then starts. If the message does not appear, I have to turn off and then turn on the laptop and enter the boot options to do the same. I updated the BIOS version to the latest (A17) according to my model, that had improved the speed at which you entered the boot options, but then I had to wait two minutes again, and the system did not start anymore fast.