[ubuntu] Dell Latitude 3550: Cannot boot from hard disk after booting from usb key!


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I had installed Ubuntu 14.04 on my Dell Latitude 3550. I worked with it with almost no problems for a week. Due to a problem with the touchpad , I tried ubuntu 15.10 by booting from a usb stick. After that, I could not boot from the hard disk anymore. The laptop enters into system checking mode and reports that no bootable medium is found. I tried to repeat the steps from this page in order to (re)create a boot option but this had no effect. All grub files (grubx64.efi,grub.cfg,MokManager.efi,shimx64.efi) were accessible from the BIOS in order to create the relevant boot option (of course I was choosing grubx64.efi according to the instructions) .

I had to install the system from the beginning (now ubuntu 15.10 it is...) in order to be able to use the laptop. I need to find what the problem is, since I will always be afraid to boot the laptop from a USB medium.
(e.g. is it only for ubuntu 14.04 or also for 15.10, if I can do something from the BIOS or correct something in /boot using ubuntu booted from usb etc)

Bear in mind that I cannot do any tests, since my laptop is up and running (takes more than half a day to bring it to this state with all my files and software!) and I cannot risk loosing everything again.

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[ubuntu] Dell Latitude 3550: Cannot boot from hard disk after booting from usb key!
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I had installed Ubuntu 14.04 on my Dell Latitude 3550. I worked with it with almost no problems for a week. Due to a problem with the touchpad , I tried ubuntu 15.10 by booting from a usb stick. After that, I could not boot from the hard disk anymore. The laptop enters into system checking mode and reports that no bootable medium is found. I tried to repeat the steps from this page in order to (re)create a boot option but this had no effect. All grub files (grubx64.efi,grub.cfg,MokManager.efi,shimx64.efi) were accessible from the BIOS in order to create the relevant boot option (of course I was choosing grubx64.efi according to the instructions) .

I had to install the system from the beginning (now ubuntu 15.10 it is...) in order to be able to use the laptop. I need to find what the problem is, since I will always be afraid to boot the laptop from a USB medium.
(e.g. is it only for ubuntu 14.04 or also for 15.10, if I can do something from the BIOS or correct something in /boot using ubuntu booted from usb etc)

Bear in mind that I cannot do any tests, since my laptop is up and running (takes more than half a day to bring it to this state with all my files and software!) and I cannot risk loosing everything again.


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