I accidentally deleted a partition and my system won't boot

Question

I deleted /dev/sda3, and now my system won't boot. I tried to use boot repair; but, it shows me an error message that says

GPT detected. Please create a BIOS-Boot partition

I created one but it doesn't work.

The image above shows the /dev/sda3 partition before it was deleted

This is what it shows now (@Pilot6)

sda3 is still there. You deleted some other partition. What was there? — Pilot6, Nov 02 '15 at 18:41
Hm. It is not related to Ubuntu. I always delete this kind of partitions with no problem. If you boot from LiveUSB, what does it show now? — Pilot6, Nov 02 '15 at 18:43
@Pilot6 it can be a root partition as in dev/sda 1 there's my recovery partition — MigueHolaa Angel, Nov 02 '15 at 18:47
Hold on, I see what is the problem. you moved the left side of your Ubuntu / partition. — Pilot6, Nov 02 '15 at 18:47
@Pilot6 I remember that when I deleted the partition it said that I would move right something — MigueHolaa Angel, Nov 02 '15 at 18:52

Pilot6 · Answer 1 · 2015-11-02T19:24:03.453

2

You moved the first sector of your Ubuntu boot partition. That is why the loader does not know where to find it.

This can be easily fixed.

Boot from a LiveUSB.

Mount you Ubuntu partition to /mnt. I see that you have done that already. But in case you boot again run:

sudo mount /dev/sda8 /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys  /mnt/sys

Then chroot and update grub:
```
sudo chroot /mnt
sudo update-grub
exit
```
Reboot to Ubuntu a normal way.

You can also try Boot repair. But you need to know that your Ubuntu partition is sda8 and the EFI partition is sda6.

edited Nov 02 '15 at 19:24

answered Nov 02 '15 at 18:52

Pilot6

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it tells me that it cannot find a device for / – MigueHolaa Angel Nov 02 '15 at 18:56
it asks me if /dev is mounted – MigueHolaa Angel Nov 02 '15 at 18:57
do I have to do something in gparted? – MigueHolaa Angel Nov 02 '15 at 19:01
Pilot? Please help – MigueHolaa Angel Nov 02 '15 at 19:05
I did that and when I rebooted it didn't work – MigueHolaa Angel Nov 02 '15 at 19:13
I added some more commands. – Pilot6 Nov 02 '15 at 19:15
It tells me that none of that mount points exist – MigueHolaa Angel Nov 02 '15 at 19:20
Boot again form LiveUSB and do everything from the beginning. – Pilot6 Nov 02 '15 at 19:20
Look what I did below – MigueHolaa Angel Nov 02 '15 at 19:22
I posted commands to a wrong place. – Pilot6 Nov 02 '15 at 19:24
Boot repair doesn't work – MigueHolaa Angel Nov 02 '15 at 19:39
What is "does not work"? – Pilot6 Nov 02 '15 at 19:41
It shows me the error that says GPT detected. Please create a BIOS-Boot partition – MigueHolaa Angel Nov 02 '15 at 19:43
That means that you boot not in UEFI mode. – Pilot6 Nov 02 '15 at 19:44
And how do I do that? – MigueHolaa Angel Nov 02 '15 at 19:46
When I go to the boot menu in bios there's no option to change from legacy to uefi – MigueHolaa Angel Nov 02 '15 at 19:52
Also I used boot repair yesterday and it worked find without the GPT detected. Please create a BIOS-Boot partition error – MigueHolaa Angel Nov 02 '15 at 19:54
So I figured out and yes I was in UEFI mode – MigueHolaa Angel Nov 02 '15 at 19:57
are you still there? It's not good to talk alone... – MigueHolaa Angel Nov 02 '15 at 19:58
Please I really need the files in Ubuntu help me @Pilot6 – MigueHolaa Angel Nov 02 '15 at 20:34
I can't teach you everything. Try to use web search how to boot in UEFI mode. Or re-install Ubuntu, if all that is too hard. – Pilot6 Nov 02 '15 at 20:37
Sry, I checked and used UEFI mode, still boot repair won't work – MigueHolaa Angel Nov 02 '15 at 20:39
It is too hard to figure out what is the problem. GPT should be OK in UEFI mode. – Pilot6 Nov 02 '15 at 20:43
Maybe the partition was important – MigueHolaa Angel Nov 02 '15 at 20:45
That partition is not related at all. It is moving of other partitions that causes problems. – Pilot6 Nov 02 '15 at 20:46

score 0 · Answer 2 · answered Nov 03 '15 at 02:00

0

Try to install grub again, run these commands in terminal.

sudo grub-install /dev/sda

then run

sudo update-grub

Then follow Pilot6 answer.

answered Nov 03 '15 at 02:00

Neil

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I accidentally deleted a partition and my system won't boot

2 Answers2