Hello David I didn't expect a rather lengthy reply from you.
> Sent: Tuesday, July 06, 2021 at 9:29 AM > From: "David" <[email protected]> > To: "debian-user mailing list" <[email protected]> > Subject: Re: How do I get back the GRUB menu with the blue background? > > > grub> echo "$prefix" > The reply is (hd0,gpt1)/boot/grub > > 6) Perhaps something else is broken, but attempting > to boot from the grub> prompt will help to diagnose that. > That is certain, and straightforward. I have given you > the steps to try, but you have not yet reported trying it. > Frankly, I don't know the exact commands to type to boot from the grub> prompt. > 7) Inside grub, the 'prefix' variable defines where > grub finds its own code. That appears to be correct, > otherwise you would see grub_rescue> prompt. > What command can I type at the grub> prompt to look inside grub so as to see the "prefix" variable? > > 9) I suppose you can use a rescue environment and > chroot to boot your system, but it seems unnecessary > unless you can't boot any other way. But if you have a > broken initrd, you will need to do this. > How can I tell if I've a broken initrd? > 10) Once booted, you will need to 'grub-install' to fix > the problem of grub.cfg not being found. Because grub > currently can't find any grub.cfg, you need to make sure > that the new one is installed to the correct location, which > needs to be outside your encrypted partition. Thanks for the mini-tutorial. > I would not > be surprised if the /boot in your new installation is not the > same as your boot partition, you should check that. > Check your mountpoints. Does 'lsblk -f' show the boot > partition is mounted at /boot? > After typing lsblk -f at the grub> prompt, the error message was can't find command 'lsblk' > Run 'grub-install -v <your_device>' > and look for output like: > grub-install: info: setting the root device to <some_device> > After typing grub-install -v (hd0,gpt2), the error message was can't find command 'grub-install' > Make sure <some_device> is your unencrypted boot partition. > If it isn't, run 'grub-install' again with the '--boot-directory' option > pointing to your boot partition. > Read 'man grub-install' for documentation of its options. > (hd0,gpt2) is my un-encrypted boot partition > a) Can you boot from grub> prompt? > No > b) At grub>, can you check the value of $root to discover > where it is looking for grub.cfg? grub> echo "$root" > hd0,gpt1 > c) At grub>, can you find grub.cfg anywhere by the > tab-completion method I described in a prior message? > Where? At the grub> prompt, I typed gr and pressed the TAB key. There was no output or suggestions. > > d) After booting somehow, if you run 'grub-install -v', what > root device does it use to to save the files that it updates, > as explained above? I'm unable to boot (frankly what commands to type to boot at the grub> prompt ?) > > e) If you reboot after running 'grub-install', does it work? > Unable to answer your question (e) because of (d) > f) Is the value of '$root' above the same location that > 'grub-install' writes to by default? If not, use its > '--boot-directory' option. > Unable to answer your question (f) because of (d)
