Speech Dispatcher and other non-human users should not be shown on LightdDM login screen and session menus

[Norbert]

Steps to reproduce:
1. Download Ubuntu MATE 19.10 alpha ISO - 20190822
2. Install it using Entire-disk erase scenario with default settings
3. Reboot system

Expected results:
* LightDM shows only just created username

Actual results:
* LightDM shows two user names, Speech Dispatcher is selected by default

Note:
problem occurs on VM and on real hardware; Minimal desktop installation is affected too; OEM installation is affected by bug 1840971 .

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: speech-dispatcher 0.9.1-2
ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
Uname: Linux 5.2.0-10-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CurrentDesktop: MATE
Date: Thu Aug 22 19:02:42 2019
InstallationDate: Installed on 2019-08-22 (0 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Alpha amd64 (20190822)
SourcePackage: speech-dispatcher
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bill (franksmcb) (franksmcb)]

Confirmed.

09212019 installs worked correctly with the exception of the OEM install (Bug#1804971)

On 09222019 this has expanded to all installs.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1841079

[Norbert (nrbrtx)]

The problem is really caused by `accountsservice` packages.
Downgrading them to 0.6.50-0ubuntu1 version (as it was in 20190821 iso) fixes the issue:

accountsservice_0.6.50-0ubuntu1_amd64.deb
gir1.2-accountsservice-1.0_0.6.50-0ubuntu1_amd64.deb
libaccountsservice0_0.6.50-0ubuntu1_amd64.deb

I determined the list of these packages by comparing the lists of installed packages from clean install of 20190821 and fully updated system (or 20190822 daily iso).

---

Steps to confirm:

```
cd ~/Downloads
wget https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/accountsservice_0.6.50-0ubuntu1_amd64.deb
wget https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/gir1.2-accountsservice-1.0_0.6.50-0ubuntu1_amd64.deb
wget https://mirrors.edge.kernel.org/ubuntu/pool/main/a/accountsservice/libaccountsservice0_0.6.50-0ubuntu1_amd64.deb
sudo apt install ./*accountsservice*.deb
```

and then reboot.

---

So it is a serious regression.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Norbert (nrbrtx)]

LightDM is affected -> Ubuntu Unity, Ubuntu MATE and any other if user set LightDM as login screen are affected.

Kylin Greeter for Ubuntu Kylin is also affected.

[fossfreedom (fossfreedom)]

Can confirm slick-greeter with Ubuntu Budgie is also affected.

[Norbert (nrbrtx)]

The problem is really even worse - I have just installed VirtualBox guest additions to the system - and now I have three users: Speech Dispatcher, user and vboxadd.

This definitely should be fixed.

[Norbert (nrbrtx)]

The second side-effect is that all three users are also shown on gear button - real human user will be confused about switching to *Speech Dispatcher* and *vboxadd* (in my case) user accounts.

[Norbert (nrbrtx)]

UbuntuStudio task is also affected.

[Norbert (nrbrtx)]

And Xubuntu too.

So I'm stopping my research.
I'm ready to test the fixed packages.

[Robert Ancell (robert-ancell)]

Can you please test accountsservice 0.6.55-0ubuntu7 and confirm if this fixes these users?

[Paul White (paulw2u)]

Works for me with Ubuntu and Ubuntu MATE.

[Gunnar Hjalmarsson (gunnarhj)]

"Speech Dispatcher" no longer shown for me either (Ubuntu 19.10 with LightDM). Thanks Robert!

Closing.

[Norbert (nrbrtx)]

Speech Dispatcher and vboxadd users are not shown on LightDM and in session menu.
Tested on all LightDM-related flavors.

Bug is fixed.
Thank you!