When a machine asks "grub rescue>" how does one say yes?

Asked by David McDonough on 2017-09-04

I have a two Tera drive with two boot sectors. Both have 16.04's systems but I can't grub to fix them. I have GParted, but when I have it look, it says it can't do a data rescue? I have disks running and don't know what to change. Yesterday some one said type c. That did nothing, as did all the start command's I can think of. How do I use GRUB boot repair?

When it starts with GRUB RESCUE> How do I say yes? How do I start it? I never should have upped from 15. Yes I have a boot for 16.04 and it won't do anything but say unknown command. How do I start it?

Question information

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Status:
Open
For:
Ubuntu Edit question
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Last query:
2017-09-19
Last reply:
2017-09-19

If you boot to the live Ubuntu CD desktop then you can install GRUB again which may make the system boot. You can even chroot to the installed OS

David McDonough (djmcd50) said : #2

Yes, I did that and no workey. What's a cigar got to do with it? How is the question. What is the command to start a reinstall?

Manfred Hampl (m-hampl) said : #3

Do you have a DVD with an Ubuntu installer on it, or a bootable USB stick with an Ubuntu installer?
I suggest that you insert it into your computer, reboot, and very early during the boot process press the function key (depending on your hardware) to select this one as boot medium.

When you see the choice "install Ubuntu" or "Try Ubuntu without installing" you should select "Try Ubuntu...".

Finally open a terminal window and issue the command
sudo fdisk -l
copy all output and paste it into this question document that we can see.

David McDonough (djmcd50) said : #4

Thanks. The last time I entered command line it was in DOS. This AD FX -8320 x8 on 64 bit with 15.7 GiB will not see the USB stick. I've tryed all the choices. Now a new copy of the 16.04 ISO on a DVD might boot. I am shutting down to try that. Thanks for the help.

David McDonough (djmcd50) said : #5

Well with a 16 .04 boot dvd and this two tera byte drive still cant get along. No boot. It got to the Ubunto count to five and sat there for twenty min's. So I put it on sdb/ cable and still no boot on the dvd. Should I trick it? It will boot to another drive with 16.04 on it. Should I do the DVD boot and then attach the two terabyte unit then re-scan the buss? Now I can't recall how to get grub rescue up? No dvd and only the bad drive I think. Nortons Disk Doctor would skip over the bad directory's and capture the files needed. Is there some thing like Samtics Disk Clinic?

David McDonough (djmcd50) said : #6

When up and running on a 16.04 Hard disk GParted shows three partitions and all the info that shows where data is on the drive but it will not mount. I snapped a picture of the window. Can I attach it to an e-mail to you? I think it's screwing with the serial buss.

Manfred Hampl (m-hampl) said : #7

There is no possibility to attach a picture to a question document.
Please upload the image to any image hosting service on the web and provide a link to that picture.

David McDonough (djmcd50) said : #8

Well thanks, that didn't help. I think you told me that last year. So I tried to up a screen shot and they told me it was to big? I don't know how to make it smaller. Your fdisk inthe comand line returned
daveman50@daveman50-GA-78LMT-USB3-6-0:~$ sudo fdisk -l
[sudo] password for daveman50:
Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 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: dos
Disk identifier: 0x169335b7

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sda2 206848 281066933 280860086 133.9G 7 HPFS/NTFS/exFAT
/dev/sda3 281067518 488396799 207329282 98.9G 5 Extended
/dev/sda5 454883328 488396799 33513472 16G 82 Linux swap / Solaris
/dev/sda6 281067520 454883327 173815808 82.9G 83 Linux

Partition table entries are not in disk order.
daveman50@daveman50-GA-78LMT-USB3-6-0:~$

How do I tell it to look for /dev/sdb or sdb1 The boot part?

Manfred Hampl (m-hampl) said : #9

The only disk shown in your output is a 250 GB disk.
No 2 TB disk is visible. Are you sure that there is not a connection problem with one of the cables?

David McDonough (djmcd50) said : #10

Tell me something I don't know. Yes I am sure both are fine. Now what?

David McDonough (djmcd50) said : #11

It shows up under disks.
ST3250620AS (3.CHL)
250 GB (250,059,350,016 bytes)
Volumes shows System RE...
Pertion 1
105 MB NT...

Next part is Filesystem
Partition 2
144 GB NTFS

next part is the top half of the rest of the space
Extended Partition
Partition 3 106 GB

Then the two on the bottom half are
 Filesystem
Partition 6
89 GB

Swap
Partition 5
17 GB Swap

All along the bottom of each part there is a star and a triangle that do nothing. And outside there is a square that says "Unmount selected partition." Next to that is a negative sign and two gears.

On the desktop icon list, the last two above the trash can are a 532GB Volume and a 950GB Volume.
So what's going on here?

David McDonough (djmcd50) said : #12

Still will not allow a CD to boot if this drive is connected during the start up.

Manfred Hampl (m-hampl) said : #13

What you list in comment #11 is the 250 GB disk.
I do not see anything that indicates a 2 TB disk.

Those icons on the desktop, can you check in the details where they are pointing to?

I suggest that you reboot your machine and look in the BIOS settings whether the 2 TB is listed there.

David McDonough (djmcd50) said : #14

No kidding? No I don't know how to "check the details..."
So I booted the 250 again and left the 2 terabyte off until finished then put the power to it and started fdisk.

Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 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: dos
Disk identifier: 0x169335b7

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sda2 206848 281066933 280860086 133.9G 7 HPFS/NTFS/exFAT
/dev/sda3 281067518 488396799 207329282 98.9G 5 Extended
/dev/sda5 454883328 488396799 33513472 16G 82 Linux swap / Solaris
/dev/sda6 281067520 454883327 173815808 82.9G 83 Linux

Partition table entries are not in disk order.

Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x4e80a046

Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 1039477361 1039475314 495.7G b W95 FAT32
/dev/sdb2 1039478782 3907028991 2867550210 1.3T 5 Extended
/dev/sdb5 3873513472 3907028991 33515520 16G 82 Linux swap / Solaris
/dev/sdb6 2018064384 3873511423 1855447040 884.8G 83 Linux

Partition 2 does not start on physical sector boundary.
Partition table entries are not in disk order.
daveman50@daveman50-GA-78LMT-USB3-6-0:~$
So how do I fix this?

David McDonough (djmcd50) said : #15

Can grub fix this?

Manfred Hampl (m-hampl) said : #16

Ok, now the two disks are shown.

Grub cannot "fix" anything. Grub is the boot loader that does what the instructions in its setting tell to do, namely forwarding control to an operating system that is installed on a hard disk, eventually after showing a selection menu to ask which one of several operating systems to use.

Just to confirm that I understood correctly: If the 2 TB is connected to the system, then it does not boot at all. But if you plug it in later, then the details of the 2 TB disk are shown.

David McDonough (djmcd50) said : #17

Yes and this morning no volume icons show in the menu. But it show up in gparted.

David McDonough (djmcd50) said : #18

If I attach just the two tera it gets to that grub question and every thing I tried will not continue from there. THen when the CD is trying to boot it stops at the Ubuntu five count and runs there for a half hour so far. That is as long as I could stand to watch nothing happen. Do you want me to copy the info from gparted? What next?

Manfred Hampl (m-hampl) said : #19

Sorry, but I have problems understanding the status of your system based on your comments.

Please explain:

Is the 2 TB disk an internal or an external disk, if it is external, how is it connected?
What happens if you try booting without the 2 TB disk (i.e. boot from the 250 GB disk)?
What happens if you try booting from the 250 GB disk with the 2 TB disk connected?
What happens if you boot from a DVD without the 2 TB disk connected?
What happens if you boot from a DVD with the 2 TB disk connected?
How did you reach the "fdisk -l" output that shows both hard disks?

David McDonough (djmcd50) said : #20

All the disks are internal. Throu a cable.
By it self it gets to the grub rescue> and stops. I cant get to go from there. (Boot the two fifty and the 2 Tera does not show up.)
It boots fine but the two Tera does not show up.
It stops booting and runs in a loop at the Ubuntu five count. Last time I let it run for half an hour.
Haven't tried that.
Like I said I connected everything and left the power off the two Terra until booted on the other drive. Then connected it and re-scan the bus.
Now the left hand icons have new ones. If I open a file, the left side has first, under the trash is a mostly black icon called system reserved and the eject button.
Then a icon for two computers and Network.
Then the next has four drive icon's. the 144GB, 532GB, 950GB, and Computer (no button) and the boot dvd for Ubuntu 16.04.2 L...

Manfred Hampl (m-hampl) said : #21

Sorry, but I do not know how to read your last comment.

David McDonough (djmcd50) said : #22

OK then how do I find some one that speaks English as their first language?

David McDonough (djmcd50) said : #23

Hello Ubuntu America Help please!!!

Can you help with this problem?

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