Using Gosa web UI in main server (+ LTSP server + Workstation):

1. add a new user as teacher
2. try to set password for the new user
3. Warnings:
Deprecated: substr(): Passing null parameter #1 ($string) of type
string is deprecated in
/usr/share/gosa/plugins/admin/users/class_userManagement.inc on line
352
Deprecated: Function uft8_decode() is deprecated in
/usr/share/gosa/include/password_methods/class_password-methods.inc on
line 391
4. try to login using the password
5. password is not correct, login fails.

I've tried several times to reproduce this issue on two Debian Edu
versions (two separate instances of version 12.8 and version 12.9).
1. All new made users of both types (students and teachers) were
created successfully
2. Passwords changed successfully
(and could not set a password with extra-Unicode chars due to password
symbol-set restrictions)
3. I see the same warnings:
Deprecated: substr(): Passing null to parameter #1 ($string) of type
string is deprecated in
/usr/share/gosa/plugins/admin/users/class_userManagement.inc on line 352
Deprecated: Function utf8 decode() is deprecated in
/usr/share/gosa/include/password-methods/class_password-methods.inc on
line 391
.. but it does not prevent to set and use new passwords.
4. successfully logged:
  - on ws01 (added as a workstation to domain "intern")
additional info with required steps for workstation:
https://wiki.debian.org/DebianEdu/Documentation/Bookworm/GettingStarted#Machine_Management_with_GOsa.2BALI-
```
Workstations with disks (including separate LTSP servers) have to be
added with GOsa². Behind the scenes, both a machine specific Kerberos
Principal (sort of account) and a related keytab file (containing a
key used as password) are generated; the keytab file needs to be
present on the workstation to be able to mount users' home
directories. Once the added system has been rebooted, log into it as
root and run /usr/share/debian-edu-config/tools/copy-host-keytab.
```
  - on diskless think-client
  - on tjener (server)
  - on GOSa (internal website)
5. could you please add more details regarding the issue?
Where persists the problem with logging in (web,tjener,diskless
client,workstation)?
Could you add log messages with this error (root@tjener# journalctl -e)?
Have you probably set a password with some special characters?