There’s no gnome-shell-extension-dashtodock package for focal [1], but I did try with Dash to Dock from extensions.gnome.org, and could not reproduce the issue with it. I tried with the default settings, as well as after recreating the look & feel of Ubuntu Dock as much as possible.
Dash to Dock has customizable action for the scroll (to either switch workspaces or windows, or to do nothing), and all of those also worked just as expected.
I also noticed that using the two finger scroll function of the touchpad on my laptop does *not* trigger this (whereas using the mouse on it does).
* [1] https://packages.ubuntu.com/search?keywords=gnome-shell-extension-dashtodock
Do you want another log for that? Because (as I already mentioned above), this also reproduces when using a newly-created user, so that means no unsupported extensions.
# Steps to reproduce
0. have a mouse with horizontal scrolling functionality (mine is a Microsoft Comfort Mouse 4500 with a tilting action for horizontal scroll)
1. move mouse pointer over the dock
2. use the mouse scroller to scroll horizontally
# What I expect to happen
Nothing
# What happens
Mouse pointer and everything on screen freezes. After a few seconds it unfreezes, but all the icons from the dock are missing. I have to log out and back in to restore the dock.
# Other info
Slightly similar to LP #1875106, but I’m not using imwheel.
I am using Wayland.
Syslog seems to always point to this one function: ”The offending callback was get_preferred_height(), a vfunc”. I’ll attach the relevant part from one crash.
I can confirm that 3.36.4-1ubuntu1~20.04.1 from -proposed fixed the issue (in Boxes) for me, i.e. the dialog text is now wrapped and hence entirely legible.
I think a warning is warranted: you may be tempted to do a dconf reset -f /, but besides clearing out schema-less keys, reset resets all affected values to their defaults. In any case, I recommend backing up your existing configuration (with dconf dump / >my-dconf.dump) before issuing a dconf reset.
I removed all but Desktop Icons, Ubuntu AppIndicators and Ubuntu Dock, rebooted and then reproduced the issue. Luckily I’ve found one way to reproduce this, albeit somewhat convoluted and still a bit unreliable, involving Synaptic and window tiling. And as it doesn’t seem to trigger the issue when using another account, I’m now working through settings differences between the two in hopes of finding something crucial.
While doing so, I did discover that dconf-editor is similarly affected:
touko 12 16:09:32 saegusa gnome-shell[8208]: WL: compositor bug: The compositor tried to use an object from one client in a 'wl_pointer.enter' for a different client.
touko 12 16:09:32 saegusa gnome-shell[8208]: WL: error in client communication (pid 12364)
touko 12 16:09:32 saegusa dconf-editor[12364]: Error reading events from display: Katkennut putki
touko 12 16:09:32 saegusa boinc[2098]: No protocol specified
touko 12 16:09:32 saegusa boinc[2098]: No protocol specified
touko 12 16:09:33 saegusa boinc[2098]: No protocol specified
touko 12 16:09:33 saegusa boinc[2098]: No protocol specified
touko 12 16:09:34 saegusa gnome-shell[8208]: WL: compositor bug: The compositor tried to use an object from one client in a 'wl_pointer.enter' for a different client.
touko 12 16:09:34 saegusa boinc[2098]: No protocol specified
touko 12 16:09:34 saegusa boinc[2098]: No protocol specified
touko 12 16:09:34 saegusa gnome-shell[8208]: WL: error in client communication (pid 12796)
touko 12 16:09:34 saegusa gnome-terminal-[12796]: Error reading events from display: Katkennut putki
touko 12 16:09:34 saegusa systemd[3569]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE
touko 12 16:09:34 saegusa systemd[3569]: gnome-terminal-server.service: Failed with result 'exit-code'.
touko 12 16:09:34 saegusa systemd[3569]: vte-spawn-da1941e8-60e5-48e5-868b-7348dd1158c7.scope: Succeeded.
touko 12 16:09:34 saegusa gnome-shell[8208]: Error adding children to desktop: this.layout.get_child_at(...) is null
touko 12 16:09:34 saegusa gnome-shell[8208]: Error adding children to desktop: this.layout.get_child_at(...) is null
touko 12 16:09:34 saegusa gnome-shell[8208]: Error adding children to desktop: this.layout.get_child_at(...) is null
touko 12 16:09:34 saegusa gnome-shell[8208]: Error adding children to desktop: this.layout.get_child_at(...) is null
Looks like dconf-editor did not exit with FAILURE, but the dconf-editor window did disappear just as Gnome terminal’s did.
Turns out the online service was just a little slow to update, and there are in fact reports sent. But the only one post-20.04-upgrade is [1] from last week, which is a gnome-shell crash and IIRC, unrelated to the terminal issue here. It seemed to be triggered by something related to media files and Nautilus, and the logs from the time are different; I’m attaching them here. (I had separated gnome-shell logs out from the main syslog, but I’ve since reverted back to having everything in syslog.)
* [1] https://errors.ubuntu.com/oops/26828e26-8fc9-11ea-acd0-fa163e983629
Since upgrading to 20.04 and switching to Wayland, Gnome terminal occasionally crashes. I interpret the corresponding logs to mean that it’s actually Wayland that fails to do something in the background, which then takes down Gnome terminal:
touko 08 11:35:16 saegusa gnome-shell[4227]: WL: compositor bug: The compositor tried to use an object from one client in a 'wl_pointer.enter' for a different client.
touko 08 11:35:16 saegusa gnome-shell[4227]: WL: error in client communication (pid 11639)
touko 08 11:35:16 saegusa gnome-terminal-[11639]: Error reading events from display: Katkennut putki
touko 08 11:35:16 saegusa systemd[4153]: vte-spawn-bbca1723-5987-4ccf-98cb-3389ad05641e.scope: Succeeded.
touko 08 11:35:16 saegusa systemd[4153]: vte-spawn-fbe02208-95df-4cf4-bfbe-fffc71d6bc7e.scope: Succeeded.
touko 08 11:35:16 saegusa systemd[4153]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE
touko 08 11:35:16 saegusa systemd[4153]: gnome-terminal-server.service: Failed with result 'exit-code'.
I have yet to nail down the precise circumstances, as this has (so far) been somewhat rare, having occurred perhaps once or twice a week.
Since the log mentions pointer, I should perhaps mention that I’ve set `org.gnome.desktop.wm.preferences` > `focus-mode` to `mouse`. Gnome terminal also exhibits other misbehaviour wrt. to this, occasionally refusing to get focus, or alternatively losing the focus, despite mouse cursor being over the terminal window.
Affected version
I’m using Ubuntu 20.04 and Wayland, with gnome-shell currently at version 3.36.1-4ubuntu1. (I originally filed this on Launchpad.)
Bug summary
When trying to start a virtual machine with Gnome Boxes, I get a prompt about keyboard shortcuts. The prompt text is localized, but translated back to English it says:
Boxes wants to inhibit shortcuts
You can restore shortcuts by pressing Super+Escape.
In my locale (Finnish), it says
Sovellus Boksit haluaa rajoittaa pikanäppäinten toimintaa.
Voit palauttaa pikanäppäinten toiminnan painamalla Super...
(sic; see attached photo)
So the actual key combination is truncated, defeating the point of that part of the text.
This isn’t a localization error (AFAICT, based on the translation source). Rather, it’s caused by the text being forced to fit on a single line of an arbitrarily fixed width, instead of wrapping to span as many lines as needed.
Screenshot
When trying to start a virtual machine with Gnome Boxes, I get a prompt about keyboard shortcuts. The prompt text is localized, but translated back to English (I think, based on [1]) it says:
Boxes wants to inhibit shortcuts
You can restore shortcuts by pressing Super+Escape.
In my locale (Finnish), it says
Sovellus Boksit haluaa rajoittaa pikanäppäinten toimintaa.
Voit palauttaa pikanäppäinten toiminnan painamalla Super…
(sic; see attached photo)
So the actual key combination is truncated, defeating the point of that part of the text.
This isn’t a localization error (AFAICT; see [2]). It’s caused by the text being forced to fit on a single line of an arbitrarily fixed width, instead of wrapping to span as many lines as needed.
(I’m reporting this against gnome-shell as opposed gnome-boxes based on [3]. Feel free to reassign as necessary.)
* [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=874526#28
* [2] https://translations.launchpad.net/ubuntu/focal/+source/gnome-shell/+pots/gnome-shell/fi/+translate?batch=10&show=all&search=pikan%C3%A4pp%C3%A4inten
* [3] https://bugzilla.redhat.com/show_bug.cgi?id=1668036
