I have a laptop with Xubuntu installed.
At install I chose the full disk encryption option.
But yesterday i accidentally dd-ed a DSL image to sda1 (/boot partition) instead to sdb1 (pendrive).
How can i repair my /boot ?
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Hello I tested the following commands in my laptop - yeah I deleted everything in
/dev/sda1 and I got it working again - so here it is:
- First lets get a clean (this was due to "dd-ed a DSL image to sda1" in OP post)
open GParted; reformat
/dev/sda1 with ext2 and don't forget to confirm the changes and then set the "boot" flag (right click on the partition --> select "Manage Flags" --> check the box next to "boot" [this automatically causes the "esp" flag to be set to] --> click the "Close" button).
Now we will prepare everything to
chroot into the installed system and then we will switch into it (via
sudo cryptsetup luksOpen /dev/sda5 sda5_crypt sudo vgscan --mknodes sudo vgchange -ay sudo mount /dev/mapper/ubuntu--vg-root /mnt sudo mount /dev/sda1 /mnt/boot for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done sudo chroot /mnt
delete and reinstall GRUB:
apt purge grub-common (have your terminal in fullscreen-mode due to ncurses), this might ask you if it shall delete everything - select yes; now lets reinstall it with
apt install grub-pc here select
/dev/sda when asked.
Lastly we need to reinstall a kernel to get the needed initrd.img-* and vmlinuz-* images into "/boot/". We get currently-installed kernels with
apt list --installed linux-image-* and now we reinstall this kernel with
apt install linux-image-[version-numbers]-generic --reinstall - don't forget to exchange the brackets with an actual version number.
Almost done; exit chroot with Ctrl + d, or just type
exit, and then reboot (via GUI menus or with