Hello,
This is actually a bug report, but I don’t know where to put it.
If I lock my screen and click the switch user button nothing happens.
So I also found out that I can use CTRL+ALt+F1 to log in with an additional user, but after that I can switch between users with CTRL+ALT+Fn without typing in any passwords.
regards,
Gregory
Sorry I cannot reproduce your issue.
I have tested both 18.04 and 19.04 using a mixture of standard and administrator users.
In all cases the lock screen kicks in. Switch User works and moves you to the slick-greeter login screen.
CTRL+ALT+F1 login then switch to a TTY - that TTY asks you for the logon password for that user - i.e. gnome-screensaver kicks in.
How can I get my actual version?
first of all, thanks for your effort and help!
Here is the output of cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"
NAME="Ubuntu"
VERSION="18.04.1 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.1 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
Is there anything more I could provide to help you debugging that issue? Maybe the tail of /var/log/auth.log?
Jan 26 22:53:52 tuxedo compiz: gkr-pam: unlocked login keyring
Jan 26 22:54:00 tuxedo polkitd(authority=local): Unregistered Authentication Agent for unix-session:2 (system bus name :1.107, object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8) (disconnected from bus)
Jan 26 22:54:02 tuxedo gdm-password]: pam_unix(gdm-password:session): session closed for user grzegorz
Jan 26 22:54:02 tuxedo systemd-logind[1056]: Removed session 2.
Jan 26 22:54:02 tuxedo systemd: pam_unix(systemd-user:session): session closed for user grzegorz
Jan 26 22:54:15 tuxedo gdm-password]: pam_unix(gdm-password:session): session opened for user grzegorz by (uid=0)
Jan 26 22:54:15 tuxedo systemd-logind[1056]: New session 4 of user grzegorz.
Jan 26 22:54:15 tuxedo systemd: pam_unix(systemd-user:session): session opened for user grzegorz by (uid=0)
Jan 26 22:54:17 tuxedo polkitd(authority=local): Registered Authentication Agent for unix-session:4 (system bus name :1.164 [budgie-polkit-dialog], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_GB.UTF-8)
Jan 26 22:59:20 tuxedo gnome-screensaver-dialog: gkr-pam: unlocked login keyringSorry, my initial description was not not very thorough. If I click the “switch user” button, then the menu disappears and comes back after a few seconds, if I move the mouse or hit a key.
By the way, I tired this again, so no there is no lock screen if I use the ctrl+alt+Fn method for switching users.
Have you installed compiz and or gdm3? … this doesn’t appear to be a valid vanilla ubuntu budgie install.
I bought the computer preinstalled with ubuntu budgie, but these two are installed:
sudo apt-get install compiz gdm3
[sudo] password for grzegorz:
Reading package lists... Done
Building dependency tree
Reading state information... Done
compiz is already the newest version (1:0.9.13.1+18.04.20180302-0ubuntu1).
compiz set to manually installed.
gdm3 is already the newest version (3.28.3-0ubuntu18.04.3).
The following package was automatically installed and is no longer required:
qt5-style-plugins
Use 'sudo apt autoremove' to remove it.
0 to upgrade, 0 to newly install, 0 to remove and 7 not to upgrade.What is your default login greeter? Gdm3 or slick-greeter?
On a vanilla UB install it is slick greeter.
Once again I have to say: I don’t know. But it seems clear to me, that somethings wrong with my preinstalled Linux. I have my home folder on a separate hard drive, so I will partition the first one, install a second ubuntu there. I will be able to use them parallel and if the second one is more stable and better than I’ll be able to switch.
Ok in the mean time I downloaded a ubuntu budgie 18.04 ISO and installed it on my computer. Everything was fine, until I restored my home folder from the second hard drive and it became bad again.
Quite astonishing, that everything went back to the old stated, so I figure all configurations are stored in my home directory.
So which config files do i have to delete, to get the desktop and login system back to its original state?
Thanks for your help 
hmm - it could be in a variety of places
e.g.
~/.config/*
~/.local/*
or in-fact any “~/.xyz” type file
Or indeed could be a dconf issue somewhere
This Q&A is a bit drastic - but the GNOME 3 instructions will work for budgie - obviously you have a backup if things get worse
wow great, it was actually that easy, thank you!
I replaced the .config and .local with the ones from the clean install I had earlier, and voila! We are nearly there 
Now the user switch is working, but there is still some minor issues (Mühsam nährt sich das Eichhörnchen…)
By the way, whats your policy here, shall I open a new thread and marked this one as solved?
kind of a continuation … so the thread is still valid.
re the first observation - yes I’m afraid that is what you have to-do. We have never found a way to get around that. I’m all ears if you find a workaround…
Re the second observation - Yes Meta + L does that - it is normal. Its something in gnome-screensaver to try to prevent the user session being still available after a wakeup… it’s not always successful though. Still needs more integration work with budgie/gnome-screensaver.