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I messed up my partitions because I wanted to increase my Ubuntu disk space (I had a boot partition between the two partitions I wanted to merge, so tried to delete merge partitions and re-install grub2) I used gparted.

But I am not able to re-install grub2 facing errors

GRUB failed to install to the following devices: /dev/nvme0n1

I have/had dual-boot configuration with a partition for windows and Ubuntu (I took some space from Windows partition to increase Ubuntu partition)

➜  ~ sudo parted -l

Model: ATA TOSHIBA MQ01ACF0 (scsi)

Disk /dev/sda: 500GB

Sector size (logical/physical): 512B/4096B

Partition Table: gpt

Disk Flags: 



Number  Start   End    Size   File system  Name                  Flags

 1      1049kB  500GB  500GB               Basic data partition  msftdata





Model: PC300 NVMe SK hynix 256GB (nvme)

Disk /dev/nvme0n1: 256GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

Disk Flags: 



Number  Start  End  Size  File system  Name  Flags

I tried to purge/reinstall grub:

sudo apt-get purge grub grub-pc grub-common
sudo apt-get install grub-common grub-pc

The problem is that GParted don't see any partition anymore :-/ so how can I create my bios-boot partition without damaging the other partitions ?

Disks how a little better view lol but my windows partition is detected as free space...

Thanks

You want to avoid using apt purge or apt remove on packages involving GRUB since it can leave your system in an unbootable state. Instead, there are two commands that exist to resolve these kinds of problems:

• 
  sudo update-grub takes an already installed GRUB and updates it's configuration so that it can find bootable partitions and put them into menu, create separate menu entries for all the available kernels, etc.


• 
  grub-install some_disk will install GRUB into the provided disk and update the Master Boot Record (MBR) of the system.

To further complicate things Windows has a very nasty habit of not actually shutting down, but instead hibernating. This causes serious problems because you shut windows down, go into Ubuntu or some other operating system, make changes to the disk, then go back into Windows. However, since you never actually "shutdown" Windows it stayed in memory and when shutting down clobbered the disk overwriting the changes you've made to the partition layout.

I have also seen a bug with GParted where some changes made to the disk while the system was booted weren't reflected in GParted until after restarting.

My suggestion is use the System Rescue CD to resolve the problem. In specific it contains Test Disk which can help recover deleted partitions, which is effectively what has likely happened.