** Description changed:
Basically I installed ubuntu 18.04.1 LTS on an old machine (on a blank
SSD), and when I just when had finished the configuration installing
just a few apps, I thought I had seen the admin's user password during
Power Off (in the boot text screen that blinks) - as it's an old
computer I could see this text blinking.
I didn't even use this machine.
After some tests, I found out that after performing these steps:
- turning the machine on, logging into admin user
- logging off the admin user
- logging in a non admin user
- logging off the non admin user
- logging in back to the admin user
By running `sudo cat /dev/tty1` I could see everything which was typed
in the login screen. And that is the content that appears during the
power off text screen.
For more info, please see https://askubuntu.com/questions/1114802
The steps I can remember while setting up this machine were:
- changing region to Portuguese (brazil) and configuring keyboard
- installing Gweled, Pitivi, VLC, Spotify and SuperTuxKart through 'Ubuntu
Software'
- installing Google Chrome and Skype by downloading their deb packages from
the official websites
- uninstalled Thunderbird
- updated everything
As you can see in the AskUbuntu question, I tried to simulate this by
repeating these steps in a virtual machine, but was not able to
reproduce it. One difference is that this is a HP Pavilion old laptop
with all sorts of things on it, so many drivers may be needed which will
not be present in the VM. I booted with 4.15.0-29-generic and it behaved
the same. However, during the session booting with the 4.15.0.29
recovery mode, I could not detect that sympton!
- I'll keep this machine for a few days, but then I'll reinstall
- everything, if it persists, I'll update here.
+ Running:
+
+ sudo lsof /dev/tty1
+
+ prints two processes, systemd-l and gdm-wayla.
+
+ I installed again the same OS on a different machine and got all the
+ updates installed - no external app installed this time. And I was able
+ to reproduce the issue. I don't know why it doesn't happen in the VM,
+ but it did happen on two different machines (on blank SSDs).
```
uname -a
Linux spider 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
```
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-screensaver (not installed)
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 2 13:38:45 2019
InstallationDate: Installed on 2019-01-30 (2 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64
(20180725)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1814388
Title:
After switching users, I can see the passwords in /dev/tty1
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