Waiting for header
 

I want boot repair. But when I was doing boot reapir Net turned off and When net was started again I execute the following commands
sudo chroot "/mnt/boot-sav/sda12" dpkg --configure -a
sudo chroot "/mnt/boot-sav/sda12" apt-get install -fy
sudo chroot "/mnt/boot-sav/sda12" apt-get install -y --force-yes grub-efi-amd64-signed shim-signed linux-signed-generic
These commands are for boot repair but it shows waiting for header. I think there are some partially installed packages so is shows this. So I tried the following command
cd /var/cache/apt/archive/partials but I donot know how to execute this command.

Boot repair is....discouraged. The PPA for boot repair seems to be inactive or not found. That is why it is waiting for header. It can't find the files, but something is keeping it looking. What are you wanting boot-repair for? Straight grub configuration is not that hard.


Zzzach...

The PPA for boot repair
 

What is the meaning of PPA for boot repair.

The external (internet) address of the installation and updating file database. In this case, where on the internet Boot Repair can be found, which it...currently...cannot be found.