How to fix MBR partition prior to Ubuntu Installation? A partition overlaps GPT backup sectors
Solution 1
I'm the author of gdisk
, and I agree with what psusi has written, with the caveat that I can't know what's really on /dev/sda5, so I can't say if it's safe to remove it. If it's the stuff that you've burned to your recovery DVDs, it should be safe to delete it, though.
If there's sufficient free space on /dev/sda5 (about 17 KiB), you should be able to resize the partition using GParted or a Windows tool, IF that tool doesn't flake out because of the illegal partition table. You might be better off backing it up to another disk, deleting it, and then restoring it. You'll need to use a backup/restore method that enables restoring to a smaller partition, though. (Alternatively, you could shrink /dev/sda4 by just a bit to make room to create a new /dev/sda5 that's as big as it is now.)
Also, on an unrelated matter, you seem to have a UEFI-based PC. On such systems, the advice to install Linux second isn't as important as it is on BIOS-based systems. (U)EFI still has a lot of flaws, but despite those problems, it's got much saner boot management than does BIOS, and Windows behaves itself better with respect to other OSes on EFI than it does on BIOS.
You might want to use gdisk
to change your Linux partitions' type codes from 0700 to 8300 to keep them from showing up as unformatted disks in Windows. See here for more on this issue.
Solution 2
You are using GPT, not MBR, and gdisk
told you what you need to do:
You will need to delete this partition or resize it in another utility.
It isn't quite clear which partition it is referring to, but that would be the last one, or number 5 in your case. It runs right up to the very last sector of the disk, which is not allowed since the GPT stores a backup copy in the last 33 sectors of the disk. If there isn't anything important on the partition, you should be able to just delete it in gdisk
.
Keroak
Updated on September 18, 2022Comments
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Keroak almost 2 years
My main problem is that i have just acquired an ASUS laptop with WINDOWS 7 and I want to install Ubuntu on it.
I want to have a dual boot to choose between both Operating systems, I read that it's better to first install Windows and then Ubuntu, because Windows installer overwrites Ubuntu's boot loader.
So, i tried to install Ubuntu 12.04 LST from an USB pendrive, but when it check for other OS doen's find the Windows 7 system.
I checked posibled causes and re-installed Windows 7 from the Recovery partition in the HD but i got the same result.
Aparently Ubuntu installer found two partition tables (GPT and MBR) and it doesn't know which one to use.
I used
gdisk
to try to solve the problem.From the fdisk and gdisk outputs below, i know that i have to fix my MBR partition but i don't know how.
ubuntu@ubuntu:~$ sudo fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 500.1 GB, 500107862016 bytes 256 heads, 63 sectors/track, 60563 cylinders, total 976773168 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 Disk identifier: 0x7834646f Device Boot Start End Blocks Id System /dev/sda1 1 4294967295 2147483647+ ee GPT
ubuntu@ubuntu:~$ sudo gdisk -l /dev/sda GPT fdisk (gdisk) version 0.8.5 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Warning! Secondary partition table overlaps the last partition by 33 blocks! You will need to delete this partition or resize it in another utility. Disk /dev/sda: 976773168 sectors, 465.8 GiB Logical sector size: 512 bytes Disk identifier (GUID): B1142EF0-26CB-4F15-9C42-AFC122E50E2A Partition table holds up to 128 entries First usable sector is 34, last usable sector is 976773134 Partitions will be aligned on 2048-sector boundaries Total free space is 122884062 sectors (58.6 GiB) Number Start (sector) End (sector) Size Code Name 1 2048 411647 200.0 MiB EF00 EFI system partition 2 411648 673791 128.0 MiB 0C01 Microsoft reserved part 3 673792 391383039 186.3 GiB 0700 Basic data partition 4 391383040 802693119 196.1 GiB 0700 Basic data partition 5 925575168 976773167 24.4 GiB 2700 Basic data partition Command (? for help): r Recovery/transformation command (? for help): o Disk size is 976773168 sectors (465.8 GiB) MBR disk identifier: 0x7834646F MBR partitions: Number Boot Start Sector End Sector Status Code 1 1 4294967295 primary 0xEE
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Keroak about 12 yearsThank you, but that's the system recovery partition. I have made the recovery's DvD's, that's why i don't know if i should erase it. I thought that i should chage or erase the MBR partition. Actually Gdisk ask me to do in another utility.
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psusi about 12 years@Keroak, there is no "MBR partition". It is telling you that you need to use another utility to resize partition, since
gdisk
doesn't do that. If you have the dvd to reinstall windows, then you don't need the recovery partition. -
Keroak about 12 yearsAh, ok.. i think i got lost in traslation. I'm already installing ubuntu ;) Thank you very much.