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I've used Plank before installing 21.04 Hirsuite Hippo. But now it is not working. And after uninstallation, I've reinstalled Plank. But I get this output in terminal:

$ plank
(plank:12385): Gtk-WARNING **: 14:04:43.852: Theme parsing error: gtk.css:9287:102: The :focused pseudo-class is deprecated. Use :focus instead.
(plank:12385): Gtk-WARNING **: 14:04:43.852: Theme parsing error: gtk.css:9292:114: The :focused pseudo-class is deprecated. Use :focus instead.
[CRITICAL 14:04:43.926827] [AbstractMain:255] Only X11 environments are supported.

I don't understand what this means:

Theme parsing error: gtk.css:9292:114: The :focused pseudo-class is deprecated. Use :focus instead.

What should I do to fix this problem?

BeastOfCaerbannog
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uyivzola
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  • In addition I upgraded to test mode of hirsuit hippo. – uyivzola May 31 '21 at 09:12
  • What do you mean by upgraded to test mode of hirsute hippo ; there is no test mode, so what do you mean? (if you mean the live or try mode; how it relates after an install is not clear as it's a different thing) – guiverc May 31 '21 at 09:16
  • Comments are for other than the op to ask questions. I suggest you add that information to your question as an [edit] at the same time as indicating which flavour of ubuntu you have upgraded from and to. – graham May 31 '21 at 09:17
  • @guiverc I've upgraded 4 weeks ago to the development release. – uyivzola May 31 '21 at 09:28
  • Refer https://askubuntu.com/help/on-topic where you'll notice only supported releases of Ubuntu and flavors are on-topic for this site. For impish indri [21.10] questions you'll need to use a development support site such as IRC (#ubuntu+1) or Ubuntu Forums, or wait until after release for this site (expected release date for Ubuntu 21.10 is 14 October 2021 (https://discourse.ubuntu.com/t/impish-indri-release-schedule/18540) when your question will be on-topic here). – guiverc May 31 '21 at 09:48

2 Answers2

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Ubuntu 21.04 chooses Wayland by default and this can happen after an upgrade. Plank runs on X11.

To solve this, please log out your session and change to X11:

How do you switch from Wayland back to Xorg in Ubuntu 17.10?

Raffa
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Gtk applications like to spit nonsensical messages on stdout. Usually that's due to programming errors; sometimes it's leftover debugging messages. One way or the other, there is usually nothing you as a user can do about it (other than redirecting them to /dev/null).

I consider that a major flaw of Gtk.

HuHa
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