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Grub2 can be configured without modifying system files.
There are also a ton of different solutions offered and issue reports opened in the ubuntu tracker.
In Cent OS 7, the default is immediately after the MBR.
-this will search for installed kernels in your partitions, then will append generic entries to the end of the file - these should be able to boot your installs - but may need tweaking to suit the specifics of your system.
A new version of /boot/grub/is available, but the version installed currently has been locally modified. * install the package maintainer's version * keep the local version currently installed * show the differences between the versions * show a side-by-side difference between the versions * show a 3-way difference between available versions * do a 3-way merge between available versions (experimental) * start a new shell to examine the situation certainly haven't modified menu.lst, so I assume the local modifications are Amazon's doing.
I'm going to hit the "keep the local version currently installed" option and hope for the best.
A good way to find out is to use GRUB from the command line to find out what is where.
This issue is very broad and use cases will impact the required solution.
If possible its highly recommended to upgrade to grub2.
With the info gained you can then manually edit the GRUB 'boot strap' stanza (the line of code visible at the bottom of the GRUB boot screen) 'on the fly' or to edit your GRUB menu (in other words edit the /boot/grub/file from live CD/other OS partition - to correct any errors.
Even if you can't boot your PC from the GRUB screen - you can drop to a command line shell by hitting the root (hd0, Possible partitions are: Partition num: 0, Filesystem type is fat, partition type 0xb Partition num: 1, Filesystem type is ext2fs, partition type 0x83 Partition num: 2, Filesystem type is ext2fs, partition type 0x83 Partition num: 3, Filesystem type unknown, partition type 0x82 On a computer with 4 partitions - 1 FAT, 2 EXT3 and a Swap partition - it would look like the above.
on a dual-boot system where updating Windows needs a number of reboots.