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Old 12-01-2021, 02:42 PM   #16
colorpurple21859
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I think
Code:
grub-install /dev/sda
will fix the problem, however on the side of caution, before doing anything, as root post the output of
Code:
parted -l
 
Old 12-01-2021, 03:38 PM   #17
colorpurple21859
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another option, copy debian /boot/grub/grub.cfg to ubuntu /boot/grub/grub.cfg. This may allow you to boot into ubuntu and rerun update-grub from ubuntu.
run the following and post before doing anything
Code:
parted -l
lsblk -f

Last edited by colorpurple21859; 12-01-2021 at 06:36 PM.
 
Old 12-06-2021, 12:12 PM   #18
no-windose
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Thanks colorpurple21859. Strangely your last two posts do not appear on my web browser when browsing linuxquestions. I have only just found them in my email!

Here is the output of parted -l and lsblk -f before I copy /boot/grub/grub.cfg onto ubuntu or reinstalling grub.

Code:
# parted -l
Model: ATA INTEL SSDSA2BW16 (scsi)
Disk /dev/sda: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  2098MB  2097MB  primary   ext4            boot
 3      2098MB  12.6GB  10.5GB  primary   linux-swap(v1)
 2      12.6GB  160GB   147GB   extended
 6      12.6GB  44.7GB  32.1GB  logical   ext4
 7      44.7GB  110GB   65.3GB  logical   ext4
 5      110GB   160GB   50.0GB  logical   ext4
Code:
# lsblk -f
NAME   FSTYPE FSVER LABEL UUID                                 FSAVAIL FSUSE% MOUNTPOINT
sda                                                                           
├─sda1 ext4   1.0         5f5ecbcd-0217-4257-a90b-a049424fc575                
├─sda2                                                                        
├─sda3 swap   1           94c2a579-24b4-4245-93f9-507e947a9436                [SWAP]
├─sda5 ext4   1.0         73d853bc-5a6f-4336-ab39-7316eabb5096                
├─sda6 ext4   1.0         8531969f-2a54-46d3-b30f-eb5205078211   19.4G    29% /
└─sda7 ext4   1.0         a4889646-6db0-41f4-b69d-1a0bf5d64b36      8G    81% /home
sr0
 
Old 12-06-2021, 12:58 PM   #19
no-windose
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colorpurple21859, it turns out that copying Debian's grub.cfg file onto Ubuntu and gave me a different GRUB menu just after booting the BIOS. Then the system automatically booted into Debian before I could choose any OS. Debian is now running kernel 5.10. So my understanding is that I was booting with the version of GRUB installed on Ubuntu. The problem appears to be solved. Thanks a lot.

I wonder if I am now booting from the version of GRUB installed on Debian or from Ubuntu's version. Debian is my main OS and I almost never use Ubuntu. How can I check this and how shall I switch to Debian's GRUB in case I am still booting from Ubuntu's GRUB?
 
Old 12-06-2021, 01:07 PM   #20
colorpurple21859
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Ubuntu grub is still in control, using the config file you copied over from debian. To let Debian grub take over boot into debian and run grub-install as per post 16 as root.

Last edited by colorpurple21859; 12-06-2021 at 01:08 PM.
 
Old 12-06-2021, 01:51 PM   #21
no-windose
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colorpurple21859. All done. Hopefully booting from Debian now. Thanks again.
 
  


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