bootusb
I had Ubuntu 12.04 Beta installed on my computer. When 12.04 was finally released, I made a bootable USB Flash Drive using Startup Disk Creator.
Then I decided to check if this drive works properly and to reinstall the system on my desktop. I must add, my desktop behaves a bit strange when it comes to bootable USB’s, it recognizes them as HDD.
In BIOS I changed priority of boot so USB Flash Drive (recognized as HDD) was first. Successfully booted, I installed Ubuntu. Everything worked fine, but…
Now I cannot boot from my real HDD. Every time I want to boot, I put the USB Flash Drive into my computer, boot, safely remove it and everything works.
What do I need to do to repair boot?
Accepted Answer
It looks like Grub got installed to the USB drive. Boot with the USB drive, open a terminal window by pressing Ctrl–Alt–T then run
sudo grub-install /dev/sdX
Where sdX is the drive you wish to boot from. That command will install GRUB to the MBR of the desired hard drive (sda,sdb,sdc,sdd), which should make it bootable. The commands sudo fdisk -l or lsblk should help you identify which drive you want.
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