[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-10-10 Thread Launchpad Bug Tracker
This bug was fixed in the package ubiquity - 21.10.9

---
ubiquity (21.10.9) impish; urgency=medium

  * ubiquity-dm: use dbus-update-activation-environment for every desktop
environment. Thanks to Gordon N. Squash for the patch. (LP: #1231091)

 -- Brian Murray   Fri, 08 Oct 2021 13:04:00 -0700

** Changed in: ubiquity (Ubuntu Impish)
   Status: In Progress => Fix Released

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-10-08 Thread Brian Murray
Thanks for adding an explanation (albeit after the fact) as to why it
was tagged rls-ii-incoming Norbert, I've gone ahead and uploaded
Gordon's change and we should be able to get it into the RC images.

** Also affects: ubiquity (Ubuntu Impish)
   Importance: High
   Status: Triaged

** Also affects: ubuntu-mate-settings (Ubuntu Impish)
   Importance: High
 Assignee: Martin Wimpress  (flexiondotorg)
   Status: Fix Released

** Changed in: ubiquity (Ubuntu Impish)
 Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubiquity (Ubuntu Impish)
   Status: Triaged => In Progress

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-10-07 Thread Norbert
rls-ii-notfixing is very positive for users with hearing problems. Keep
doing. Patch is in the bug-report.

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-10-07 Thread Brian Murray
** Tags removed: rls-ii-incoming
** Tags added: rls-ii-notfixing

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-10-02 Thread Norbert
Impish is still affected, tested on

Ubuntu-MATE 21.10 "Impish Indri" - Beta amd64 (20211002)

** Tags added: rls-ii-incoming

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-09-17 Thread Guy Schlosser
Not sure if this will help or not, but I too am having the same
installer bug. Along with this, I cannot drop to a terminal and run
something like gparted. I have no speech, and alt+tabbing results in
Orca saying gparted as super-user. Ubuntu live images are a huge
trouble-shooting tool in my day to day work, so I really hope this gets
resolved soon.

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-08-28 Thread Gordon N. Squash
** Merge proposal linked:
   
https://code.launchpad.net/~thesquash/ubuntu/+source/ubiquity/+git/ubiquity/+merge/407632

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-08-24 Thread Gordon N. Squash
I'm pretty sure I discovered the bug, and I think I know how to rectify it too.
Please note that this was a tricky bug to find and it made my head spin for a
while; it was only recently when I figured this out from start to end.  Here's
what I know now:

I discovered that Ubiquity's greeter (`maybe-ubiquity`) starts two D-Busses:
the normal session bus, which non-root programs communicate over for
pretty much everything (including accessibility communications), and the
special accessibility bus, which is only used by root programs like Ubiquity.
The accessibility bus uses a special configuration file which allows root to
use the bus (normally root would be banned from the bus); that configuration
file is stored at /usr/share/defaults/at-spi2/accessibility.conf:

   [...]
   
 
 
 
 
 
 
 
 
   
   [...]

Depending on the version of Ubuntu in use, the exact application which requests
the accessibility bus in the first place (and thus the application which
requests the bus to be launched) differs.  On stock Ubuntu, it is a portion of
the GNOME Settings Daemon; on Ubuntu MATE, it is consistently the Ubiquity
panel.  Either way, which application starts the bus doesn't matter, as long
as an application starts it.

When an application requests the bus be started, the D-Bus daemon requests that
SystemD launches the `at-spi-bus-launcher` program.  This program starts
another, separate D-Bus daemon (separate from the main session bus, that is),
and tells this new D-Bus daemon to use the aforementioned configuration file.
The bus launcher also requests that the new D-Bus daemon inform the bus
launcher about how the new D-Bus daemon can be addressed and contacted; the
applications need to know about this bus and they need to know how to
communicate on it.  The D-Bus daemon tells the bus launcher how to contact it
when the D-Bus daemon has initialized itself fully.

Once the bus launcher knows how to contact the accessibility bus, the bus
launcher is supposed to set an *X11 atom* on the root window of the X session
which Ubiquity is using.  The atom applied to the root window means that any
application, even Ubiquity, can quickly and easily find out how to communicate
over the accessibility bus.  Here's an example of the atom:

   $ DISPLAY=":0" xprop -root AT_SPI_BUS
   AT_SPI_BUS(STRING) = 
"unix:abstract=/tmp/dbus-jvfzJSsTTp,guid=e1dc67ddfb5b08287b1b9676612460d8"

This means that the accessibility bus can be reached using a UNIX domain socket
(so it can be accessed only on the local system); a proper call to "bind" to
the socket at `/tmp/dbus-jvfzJSsTTp` will connect to the accessibility bus
(though the `abstract` part means that the socket is not visible in the file
system; this is a Linux-only feature, and you'll sometimes see `path` instead,
which means the socket can be viewed as part of the file system); and in order
to verify that the application is authenticated to access the bus, it must pass
the globally unique identifier `e1dc67ddfb5b08287b1b9676612460d8` as proof that
it's not an external attacker.

Sounds straightforward, right?  Wrong.  How does the bus launcher know what the
address of the *X server* is?  Sure, there is the `DISPLAY` environment
variable, and that is what the bus launcher tries to get access to; but in
general, on UNIX one process cannot get access to an environment variable
unless it inherited that variable from its parent.

So who's the parent of the bus launcher?  You'd think it would be the Ubiquity
panel, for example, or the GNOME Settings Daemon, since those programs
*requested* the accessibility bus in the first place.  Not so; remember how I
said that *the Ubiquity panel requests* that *D-Bus requests* that *SystemD
launches* the accessibility bus?  (Yes, it really *is* that big of a game of
Telephone.)  But the D-Bus session bus daemon doesn't know what the contents
of the X11 `DISPLAY` variable are -- I verified this -- much less does SystemD
know that.  So how is the accessibility bus supposed to know what X11 display
to use??

This one took a lot of digging.  Ultimately, it was just luck that I came
across the `/usr/bin/ubiquity-dm` program, which holds the key (excerpted from
line 407 et seq.):

   if (
   osextras.find_on_path("kwin") or
   osextras.find_on_path("kwin_x11") or
   osextras.find_on_path("gnome-shell")
   ) and osextras.find_on_path("dbus-update-activation-environment"):
   subprocess.Popen(
   [
   "dbus-update-activation-environment",
   "--verbose",
   "--systemd",
   "DISPLAY",
   ],
   stdin=null,
   stdout=logfile,
   stderr=logfile,
   preexec_fn=self.drop_privileges,
   )

Okay, what's going on here?  Let's break this down:  If KWin or the GNOME Shell
are installed, 

[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-08-21 Thread Gordon N. Squash
It's been well over a month since I last reported on this, so I think
it's fine time I reported about the latest on the subject.

My above comment was mostly correct and slightly wrong.  Interestingly,
stock Ubuntu 21.10 does not use Wayland (on my setup, at least, with
Intel integrated graphics); it uses X11, just like Ubuntu MATE does.
But interestingly, Ubiquity on stock Ubuntu starts the *GNOME Shell*,
whereas Ubiquity on Ubuntu MATE only starts Marco, a generic Ubiquity
top panel (which is supposed to be stocked with indicators, but
Ubiquity's panel only works with Unity indicators and not Ayatana
indicators), the MATE Settings Daemon, and a handful of other programs.

Furthermore, like I suspected, both Ubuntu and Ubuntu MATE start the
Ubiquity greeter as root, except their *effective* user IDs are both the
respective live session users (`ubuntu` and `ubuntu-mate`,
respectively).  The latter is done probably to allow communication over
D-Bus, because my experiments show that if the process' effective UID is
not 999 (the live session user), neither version of Ubiquity will
interact with the screen reader.

Here's the proof.  The first snippet was taken on an Ubuntu 21.10 system
(that took me eons to download); the second is from an Ubuntu MATE 21.10
system.

Ubuntu:

   RUSEREUSERPIDPPID COMMAND
   ubuntu   ubuntu  19481941 /usr/bin/pipewire
   ubuntu   ubuntu  19491941 /usr/bin/pipewire-media-session
   ubuntu   ubuntu  19501941 /usr/bin/pulseaudio --daemonize=no 
--log-target=journal
   ubuntu   ubuntu  19531941 /usr/bin/dbus-daemon --session 
--address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
   ubuntu   ubuntu  19661941 /usr/libexec/dconf-service
   ubuntu   ubuntu  19831703 /usr/libexec/gsd-a11y-settings
   ubuntu   ubuntu  19861703 /usr/libexec/gsd-keyboard
   ubuntu   ubuntu  19871703 /usr/libexec/gsd-media-keys
   ubuntu   ubuntu  20041703 /usr/libexec/gsd-power
   ubuntu   ubuntu  20051703 /usr/libexec/gsd-xsettings
   ubuntu   ubuntu  20061703 gnome-shell --sm-disable --mode=ubiquity
   root ubuntu  20282009 /usr/bin/python3 
/usr/lib/ubiquity/bin/ubiquity --greeter --only
   ubuntu   ubuntu  21512146 /usr/bin/dbus-daemon 
--config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork 
--print-address 3
   ubuntu   ubuntu  21661941 /usr/libexec/at-spi2-registryd 
--use-gnome-session

Ubuntu MATE:

   RUSEREUSERPIDPPID COMMAND
   ubuntu-+ ubuntu-+18821875 /usr/bin/pulseaudio --daemonize=no 
--log-target=journal
   ubuntu-+ ubuntu-+18931875 /usr/bin/dbus-daemon --session 
--address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
   ubuntu-+ ubuntu-+18961875 /usr/libexec/dconf-service
   ubuntu-+ ubuntu-+19261694 /usr/bin/mate-settings-daemon
   ubuntu-+ ubuntu-+19271694 marco --sm-disable
   ubuntu-+ ubuntu-+19311694 /usr/lib/ubiquity/panel
   ubuntu-+ ubuntu-+19381694 nm-applet
   ubuntu-+ ubuntu-+20001875 /usr/libexec/at-spi-bus-launcher
   ubuntu-+ ubuntu-+20072000 /usr/bin/dbus-daemon 
--config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork 
--print-address 3
   root ubuntu-+20081942 /usr/bin/python3 
/usr/lib/ubiquity/bin/ubiquity --greeter --only
   ubuntu-+ ubuntu-+20931875 /usr/libexec/at-spi2-registryd 
--use-gnome-session

The output was abbreviated slightly; I remove unrelated processes like
the RealtimeKit daemon and UDisks.

As you can see, the Ubiquity process (`/usr/bin/python3
/usr/lib/ubiquity/bin/ubiquity` on both of them) runs with a real UID of
root, but an effective UID of either `ubuntu` or `ubuntu-mate` (the
latter was chopped off by `ps`).  So there's no dissimilarity there.

***However...***

With the screen reader enabled, from a command line (Ctrl-Alt-F2) I
tried launching a text editor on each of them, first as user 999:

   DISPLAY=":0" pluma &

...and then as root:

   sudo env DISPLAY=":0" pluma &

...and then with a real UID of 0 and an effective UID of 999, just like
Ubiquity:

   sudo env DISPLAY=":0" setpriv --ruid 0 --rgid 0 --euid 999 --egid 999
--init-groups pluma &

The first command cooperated with the screen reader on both systems
(i.e., the screen reader told me stuff like "Edit menu... Select All
Ctrl-A").  The last two commands worked fine on Ubuntu but not on Ubuntu
MATE.

I tried these experiments also on the live desktop, not just at the
Ubiquity greeter.  The results were the same regardless of whether I
tried it on the live desktop or on the Ubiquity greeter.

Clearly, Ubuntu and Ubuntu MATE are configured differently, somehow
pertaining to user IDs allowed to use accessibility features.  But
where?

I ran the above experiments, but through `strace -s 1048576` to capture
all (or most) communications going on between pluma / gedit and D-Bus.
The 

[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-07-30 Thread Norbert
** Tags removed: saucy
** Tags added: impish

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-07-01 Thread Gordon N. Squash
Regarding @hellsworth's observation (post # 11):

Though this observation may well lead us down the correct path, I
strongly believe both run as the superuser.  Here's why:

For the record, the MATE desktop's window manager is Marco; the "window
manager" on stock Ubuntu is Mutter since stock Ubuntu uses the GNOME
desktop.  Another thing to note is that stock Ubuntu tends to use
Wayland by default, whereas Ubuntu MATE exclusively uses X11 (mainly
because the MATE applications don't work very well on Wayland yet).

Marco adds the " (as superuser)" suffix to the end of windows which are
owned by the superuser.  The Marco code which adds the suffix is located
on lines 486-491 in the source file `src/core/window-props.c` (see
https://github.com/mate-desktop/marco/blob/master/src/core/window-
props.c#L486-L491):

 if (window_owner==0)
   {
 /* Simple case-- don't bother to look it up.  It's root. */
 *target = g_strdup_printf (_("%s (as superuser)"),
title);
   }

I was going to look up whether Mutter has a similar block of code for
the function, but I discovered I didn't need to:  On stock Ubuntu, the
maybe-ubiquity screen uses just a plain old, client-side-decorated
header bar, which bypasses the window manager's own decorations.  I can
prove it since this screenshot (https://phoenixnap.com/kb/wp-
content/uploads/2021/04/choose-keyboard-layout-for-ubuntu-20.04.png)
shows Ubiquity's title bar without the menu button on the left side of
the window title bar; the menu icon (which is a group of three white
horizontal lines) always appears with the default Mutter settings if
Mutter draws the window title.  Note that Mutter never draws the window
title on Wayland.

So in other words, just because one says it's run as the superuser and
the other doesn't say it does not mean that the other is not run as the
superuser.  To find the real answer, we'd have to boot up a stock Ubuntu
to the maybe-ubiquity screen, press Ctrl-Alt-F1 to go to a console, log
in, and then use `ps` to find out who owns the `ubiquity` process.

However, furthermore it would be a good experiment to find out if the
Wayland / X11 difference is the culprit.  I wonder if any accessibility
information is communicated over the X protocol, or if it's all done via
D-Bus?

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  Screenreader starts, but does not work with installer (ubiquity) in
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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-12 Thread Jean-Baptiste Lallement
** Changed in: ubiquity (Ubuntu)
   Status: Confirmed => Triaged

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-08 Thread Norbert
** Changed in: ubiquity (Ubuntu)
   Status: Triaged => Confirmed

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  Screenreader starts, but does not work with installer (ubiquity) in
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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-07 Thread Launchpad Bug Tracker
This bug was fixed in the package ubuntu-mate-settings - 21.04.7

---
ubuntu-mate-settings (21.04.7) hirsute; urgency=medium

  * Disable LightDM manual login. (LP: #1895875)
  * Enable assistive technologies in the live session (LP: #1231091)

 -- Martin Wimpress   Wed, 07 Apr 2021 09:30:09 +0100

** Changed in: ubuntu-mate-settings (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-07 Thread Martin Wimpress 
** Changed in: ubuntu-mate-settings (Ubuntu)
   Status: In Progress => Fix Committed

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-07 Thread Martin Wimpress 
It appears that ubiquity is being invoked via sudo for all flavours,
including Ubuntu. Here is the Exec= line from ubiquity.desktop:

```
#use sh because pkexec is broken under xfce/lxce http://pad.lv/1193526
Exec=sudo --preserve-env=DBUS_SESSION_BUS_ADDRESS,XDG_RUNTIME_DIR sh -c 
'ubiquity gtk_ui'
```

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-04-07 Thread Martin Wimpress 
** Also affects: ubuntu-mate-settings (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: ubuntu-mate-settings (Ubuntu)
   Status: New => In Progress

** Changed in: ubuntu-mate-settings (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-mate-settings (Ubuntu)
 Assignee: (unassigned) => Martin Wimpress  (flexiondotorg)

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-03-25 Thread Sai Vinoba
@hellsworth, nice catch. That could be an issue.

As you noticed, bug #1874283 is duplicate of this. I'll try to combine
the two with current status, to best of my understanding and testing.

1) When we hear the sound, we can start orca screen reader with Super+Alt+s. No 
audio feedback for the screen, language selection or choosing one of 'Try 
Ubuntu (MATE)' or 'Install Ubuntu (MATE)'. 
 - Current status: Audio feedback available in Ubuntu default but not in Ubuntu 
MATE.

2) Some commented that if they boot into efi mode the screen reader installer 
worked fine but had problem only in BIOS mode. 
 - Current status: Both modes have problems (definitely 20.10 onwards).

3) Some commented that if they used live mode (Try Ubuntu), the screenreader 
worked fine for installation but not if they choose installer directly (Install 
Ubuntu). 
 - Current status: Screen reader does not work if installer started from inside 
live mode both in Ubuntu default and Ubuntu MATE.

4) On the other hand, we were suggested quite the opposite; that it will work 
fine if we select installer directly but not if we select live mode first. 
 - Current status: Screenreader works when starting installer directly only for 
Ubuntu default. No luck on Ubuntu MATE.

5) Screen reader works if we start assistive technology in live mode (Thanks 
@artemiy-22). 
 - Current status: This works in Ubuntu MATE (could not get it to work on 
Ubuntu 20.04). 

Following are steps to make screenreader install work in Ubuntu MATE.
  a) Select 'Try Ubuntu'
  b) Once the desktop loads, open 'Assistive Technologies Preferences' and 
check 'enable assistive technologies'. This I had to do even when screenreader 
was on (Alt+Super+s).
  c) Choose 'Close and Log Out'. (Just using 'Close' does not work, we have to 
end the current session).
  d) Select 'Live session user' in the login screen and hit return (no 
password).
  e) After we re-login and start the screenreader, we can use installer in 
blind user mode.

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-03-24 Thread Heather Ellsworth
I can reproduce this problem (exactly what is described in comment #10)
with the 20210324 daily build of Ubuntu MATE. The problem *does not*
exist in the 20210324 daily build of regular Ubuntu.

The only difference I see here is that when you start an install and
you're presented with the Install screen, the regular Ubuntu says
"Install" and the Ubuntu MATE one says "Install (as superuser)".

So why does the MATE installer use superuser privs and is this
absolutely necessary?

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Title:
  Screenreader starts, but does not work with installer (ubiquity) in
  live session

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-03-03 Thread Sai Vinoba
Still fails as tested with 20210304 ISO of Ubuntu MATE.

1) No audio feedback during initial language selection, before going into live 
session. If somebody wants language other than English, pressing up/down arrows 
doesn't read the language name.
2) When in live session, once installer starts, no audio feedback.

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Title:
  Screenreader starts, but does not work with installer (ubiquity) in
  live session

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-02-04 Thread Brian Murray
** Tags removed: rls-hh-incoming
** Tags added: hirsute rls-hh-notfixing

** Changed in: ubiquity (Ubuntu)
   Status: Confirmed => Triaged

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Title:
  Screenreader starts, but does not work with installer (ubiquity) in
  live session

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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-02-04 Thread Dimitri John Ledkov
because ubiquity is priviledged sudo process for which we prohibit the
user permissions-only screenreader to read, as if ubiquity, when
launched from live session should kill screenreader, and relaunch it. Or
like run its own instance.

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Title:
  Screenreader starts, but does not work with installer (ubiquity) in
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[Bug 1231091] Re: Screenreader starts, but does not work with installer (ubiquity) in live session

2021-02-03 Thread William Wilson
I'm able to recreate this in hirsute and focal. I tested on 2 different
machines and saw this behavior 3 out of 3 times I tried it.

** Tags added: rls-hh-incoming

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Title:
  Screenreader starts, but does not work with installer (ubiquity) in
  live session

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