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I'm experimenting reducing a Debian 9.9 xfce live ISO (just to start with a Debian image, not because it's special).

  1. Unsquash the filesystem.squash from the live image

  2. Enter chroot on the created directory.

  3. Uninstall/install packages.

  4. Squash the directory.

  5. Add the new filesystem.squash to a custom directory (with the live image's initrd and vmlinuz)

  6. Geniso the custom directory.

The new image boots (VirtualBox), but when it reaches the tty1, what seems a loop (very fast, so it's difficult to read) prompts something similar to "fail autologin" and then stop to a blank cursor. From there I can access only to tty6, but can't login with any user.


Details

Step 3: To reduce the image, I make an install of Debian netisnt without desktop environment, copy the packages installed to txt file. In my chroot enviroment, I uninstall all packages exept the ones on the txt.

Step 4: When I squash the chroot directory this appears (maybe here's the issue) but...

Failed to read file squashfs-root/etc/.pwd.lock, creating empty file
[|                                                                ]   81/5804   1%
Failed to read file squashfs-root/etc/group-, creating empty file
[=|                                                               ]  122/5804   2%
Failed to read file squashfs-root/etc/gshadow, creating empty file
[=/                                                               ]  131/5804   2%
Failed to read file squashfs-root/etc/gshadow-, creating empty file
[=/                                                               ]  131/5804   2%
Failed to read file squashfs-root/etc/passwd-, creating empty file
[=/                                                               ]  178/5804   3%
Failed to read file squashfs-root/etc/security/opasswd, creating empty file
[==/                                                              ]  191/5804   3%
Failed to read file squashfs-root/etc/shadow, creating empty file
[==/                                                              ]  195/5804   3%
Failed to read file squashfs-root/etc/shadow-, creating empty file
[==/                                                              ]  195/5804   3%
Failed to read file squashfs-root/etc/subgid-, creating empty file
[==/                                                              ]  201/5804   3%
Failed to read file squashfs-root/etc/subuid-, creating empty file
[==/                                                              ]  202/5804   3%
Failed to read file squashfs-root/etc/sudoers, creating empty file

...when I check the files, say shadow, it looks normal, not an empty file.

Step 5: I use the live image's vmlinuz and initrd, not the chroot's, because, I think obviously, the custom ISO freezes in kernel panic. The kernel is the same both live image's and netinst installation.


I'm aware that all this changes can lead surely to a broken system, but reaching the tty (well, kinda) gives me hope that it's doable. For this reason, I don't expect that a reasonable solution can be given, but I'm running out of ideas.

To resume: is possible to stop the autologin (of any user) once the system reaches the tty1? Is there another reason why this couldn't work?

EDIT: upload a picture before reaching the tty1, if it is of any use:

enter image description here

thanks

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