Text console login does not allow login - it behaves as if "entered" is continuously keyed after "login". N

[Michael Grivas]

The following happens with any user, WITHOUT typing any password !! Only one "ENTER" keyed.
Login: myuser
Password:

Login incorrect
Login:

Login incorrect
...

To happens to all Alt+Ctrl+Fx , while no problem appears in graphical terminals or Gnome.
That appeared only after the last updates, with kernel 4.15.0-45 .
If I boot back to 4.15.0-43 the issue does not appear.

The /var/log/auth.log shows:
login[6180]: pam_unix(login:auth): conversation failed
login[6180]: pam_unix(login:auth): auth could not identify password for [myuser]
login[6180]: FAILED LOGIN (1) on '/dev/tty3' FOR 'myuser', Authentication failure
login[6180]: pam_securetty(login:auth): cannot determine username
login[6180]: FAILED LOGIN (2) on '/dev/tty3' FOR 'UNKNOWN', Error in service module
login[6180]: pam_securetty(login:auth): cannot determine username
login[6180]: FAILED LOGIN (3) on '/dev/tty3' FOR 'UNKNOWN', Error in service module
login[6180]: pam_securetty(login:auth): cannot determine username
login[6180]: FAILED LOGIN (4) on '/dev/tty3' FOR 'UNKNOWN', Error in service module

The /var/log/audit.log shows:
type=USER_LOGIN msg=audit(1550742677.578:221): pid=7230 uid=0 auid=4294967295 ses=4294967295 msg='op=login acct="UNKNOWN" exe="/bin/login" hostname=P50 addr=? terminal=/dev/tty3 res=failed'
type=USER_AUTH msg=audit(1550742680.902:222): pid=7230 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:authentication acct="?" exe="/bin/login" hostname=P50 addr=? terminal=/dev/tty3 res=failed'
type=USER_LOGIN msg=audit(1550742680.902:223): pid=7230 uid=0 auid=4294967295 ses=4294967295 msg='op=login acct="UNKNOWN" exe="/bin/login" hostname=P50 addr=? terminal=/dev/tty3 res=failed'
type=SERVICE_STOP msg=audit(1550742730.226:224): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=getty@tty3 comm="systemd" exe="/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
type=SERVICE_START msg=audit(1550742730.226:225): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=getty@tty3 comm="systemd" exe="/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
type=SERVICE_STOP msg=audit(1550742730.226:226): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=getty@tty3 comm="systemd" exe="/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
type=SERVICE_START msg=audit(1550742730.230:227): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=getty@tty3 comm="systemd" exe="/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: login 1:4.5-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb 21 10:17:48 2019
InstallationDate: Installed on 2018-11-05 (107 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: shadow
UpgradeStatus: No upgrade log present (probably fresh install)