You might have a look at your partition layout: fdisk -l /dev/sda
Also, your UEFI motherboard could be booting in legacy BIOS
A couple of months back, I had to re-arrange a borked Debian
install. This is a
4 TB Western Digital Black drive on a UEFI motherboard:
[0:root@TUX ~]$ fdisk -l /dev/sda
Disk /dev/sda: 3.7 TiB, 4000787030016
bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 170B3F1A-BFD5-4785-B5E8-803B2B036244
Device Start End Sectors Size Type
/dev/sda1 2048 6143 4096 2M BIOS
/dev/sda2 6144 67115007 67108864 32G Linux
/dev/sda3 67115008 68114432 999425 488M
Microsoft basic data
/dev/sda4 68116480 7812083341 7743966862 3.6T Linux
/dev/sda5 7812083712 7814037134 1953423 953.8M Linux
I don't remember why I had to define /dev/sda3. I think Debian
insisted on it.
If the disk doesn't use EFI, you need the 'BIOS boot' partition. It
only has to
be 1 MB (maybe less) but this was my first time doing this and I
wanted to be
sure I didn't have to re-arrange partitions again. Lots of copying
waiting, waiting, waiting. Breaking mirrors and re-syncing them.
Lots of fun.
If you are using it as an EFI disk, you need a different partition
the 'BIOS boot' but don't rememer what it is.
On 6/27/2017 9:35 PM, William Mattison
(replying to all three messages)
When I boot, the bios display says it is UEFI. Am I mis-understanding what that means? Am I mis-using the term?
My /boot directory has only two sub-directories: "grub" and "grub2", no sub-directory "efi".
Each of the two sub-directories has a file called "grub.cfg". The two files are identical, except for permissions.
In /etc/fstab, the UUIDs are already correct, based on output by both the blkid command and the lsblk command (which blkid's man page says I really should use instead).
I tried the grub2-mkconfig command in both sub-directories. Then I rebooted. The new menu has Fedora, other Fedora options, Windows 7 (on /dev/sda1), and Windows 7 (on /dev/sda2). Each option appears to boot up correctly, though I did not attempt to actually log in to a windows account.
Why are there two menu entries for windows? On this system, sda1 is the master boot record, sda2 is the windows partition.
After signing in to Fedora, I get a crash message saying vmlinuz crashed. I couldn't catch the whole message. Yet the system does seem to work. What's going on?
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