Is it possible to set up domain name substitution when logging into Ubuntu through AD?

Question

linux

Good morning!
I entered the computer with ubuntu, into the windows domain, set up a manual login, I log in successfully.
Issues 2:
1. You must enter a full username like [email protected]
2. After turning on the screensaver, when trying to log in, it is suggested to do this from the current local admin, and not from a domain user who has left for 5 minutes, for example. To defeat the situation, you need to select "another user", and then completely repeat step 1. The session is saved.
I repeat, everything works, these questions do not bother me, but I would like to give users easier access. They still have to enter a password ...
Is this possible?

Answer 1

answer to 1 :
into sssd.conf:
use_fully_qualified_names=false

Answer 2

Introduced a computer with ubuntu, in windows domain

How? samba, pam_ldap, sssd? All methods known to me do not require specifying the domain tail when logging in, the system simply switches to different sources when searching for a user.
For example:
# id testonlytt
uid=233819(testonlytt) gid=200513(domain users) groups=200513(domain users),235126(accessextended),201164(vpn users),235697(newproxy)
# getent passwd testonlytt
testonlytt:*:233819 :200513:Prosto Test Testovich: /usr/share/smbusers/testonlytt:/bin/sh
testonlytt - domain user, from AD