The reference book is LFS 7.0.
Host system is Ubuntu 11.10.

I will try to recall all the steps I have done before the problem appeared, but it can be not precise...

I had to reload the system after Chapter 5.3 "Stripping", then continued from Chapter 5.4. It seems that at Chapter 6.4. "Entering the Chroot Environment" the root directory was not changed, because the directory /sources was not accessible. But I did not pay attention and continued up to Chapter "6.7. Linux-3.1 API Headers". So all the directories and links of chapters 6.5 and 6.6 where created over another root directory.

Moreover, it seems I entered as a root when creating directories after the message ".. have no permissions" appeared.

Then I rebooted the PC and I am observing the black screen now. Grub2 screen allows to access to rescue mode, but I have no idea what to do there to repair the system.

Now the questions: Could you, please, explain me what can be done to repair my host system, and why the fault has happen?

Regards...

Hi

Here is a good page to look
https://help.ubuntu.com/community/LiveCdRecovery

I assume the problem is that the files /etc/passwd and /etc/group were redefined on the host system by the commands in Chapter 6.6. Might be a good idea to restore them from another host. Other thoughts?

Hi

The link I posted shows how to create a new user
You could then give them root privilages.
Might be easier to reinstall if you have over written other dirs/files

Tnx, spiky0011
Yes, re-installation can be a solution but not for a LFS user .)
As I sad I still have access to the shell, the black screen appears and holds after the Ubuntu logo with dots. Looks like I still have a chance to recover.

Both of those may have hidden backups. It's worth a try anyway.

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Helped!
I have working system now! Tnx a lot!