1. Download debian live-CD/DVD from:
https://cdimage.debian.org/debian-cd/current/amd64/iso-hybrid/debian-live-12.5.0-amd64-xfce.iso
or
https://ftp.gwdg.de/debian-cd/12.5.0-live/amd64/iso-hybrid/debian-live-12.5.0-amd64-xfce.iso
2. Boot from this DVD
3. Doubble click on "Install to harddisk"
4. Select to erase a partitioned harddisk
5. Select "German"
6. For User and Passwort enter
    Full name: demo Demo
    Username: de-de
    Password 1st: start123
    Password 2nd: start123
7. Click install
8. Wait until the installer finishes and reboots into this newly installed
system
9. Try to login with the credentials given above:
    User: de-de
    Password: start123

The newly installed system just tells: unknown user or password, user or
password wrong. You wont be able to login.
Having a closer look at the system installed:
- The system language ist set to en_US, instead, as selected to de_DE.
- The keyboard language and layout ist set to en_US, instead, as selected
to de_DE.
- The user given isn't created at all.
- The password isn't entered into /etc/passwd or /etc/shadow.
- Root is created, but does not have a password, while passwordless logins
are prohibited

Conclusion: it is not possible to login to the system. Youl have to hack it
to get access.

This is installation with Calamares installer, so re-assigning.

Hello Thomas,

Your bug report got a bit lost, but now it is reported against the tool
that generates the live images.

To reproduce, I've used a 12.8 XFCE live image instead of the older 12.5
image.

My steps:
* Boot from the first GRUB menu entry using UEFI secure boot
* From the desktop, start 'Install Debian' (i.e. Calamares)
* Select 'Berlin' on the 'Location' tab
* Don't change 'The system language' (default=American English, United
States)
* Select 'German' on the 'Keyboard' tab
* Enter 'de-de' for the username
   Here I noticed that the key to the right of the zero produces ß (as
on a German keyboard, and I needed to press the key to the right of . to
get the minus symbol

Calamares manipulates the global keyboard setting, in the system bar at
the top it still shows 'EN', but opening 'Terminal Emulator' shows that
the German keyboard layout has been activated.

After the reboot, the value for the environment variable 'LANG' was
'en_US.UTF-8' and the 'LC_*' values were 'de_DE.UTF-8' (This was all
perfectly matching the entries that were made in Calamares).

Since you have used a minus for the username, whose location on the
keyboard depends on the active keyboard layout, could you try to
reproduce this again?

With kind regards,
Roland Clobus

Hello Thomas,

Your bug report got a bit lost, but now it is reported against the tool
that generates the live images.

To reproduce, I've used a 12.8 XFCE live image instead of the older 12.5
image.

My steps:
* Boot from the first GRUB menu entry using UEFI secure boot
* From the desktop, start 'Install Debian' (i.e. Calamares)
* Select 'Berlin' on the 'Location' tab
* Don't change 'The system language' (default=American English, United
States)
* Select 'German' on the 'Keyboard' tab
* Enter 'de-de' for the username
   Here I noticed that the key to the right of the zero produces ß (as
on a German keyboard, and I needed to press the key to the right of . to
get the minus symbol

Calamares manipulates the global keyboard setting, in the system bar at
the top it still shows 'EN', but opening 'Terminal Emulator' shows that
the German keyboard layout has been activated.

After the reboot, the value for the environment variable 'LANG' was
'en_US.UTF-8' and the 'LC_*' values were 'de_DE.UTF-8' (This was all
perfectly matching the entries that were made in Calamares).

Since you have used a minus for the username, whose location on the
keyboard depends on the active keyboard layout, could you try to
reproduce this again?

With kind regards,
Roland Clobus