Missing X server or $DISPLAY

From	Jukka Lahtinen <jtfjdehf@hotmail.com.invalid>
Newsgroups	alt.os.linux.fedora
Subject	Missing X server or $DISPLAY
Date	2025-08-01 01:36 +0300
Organization	A noiseless patient Spider
Message-ID	<87y0s4oun4.fsf@sonera.fi> (permalink)

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I upgraded my Fedora 42 installation with dnf upgrade (all packages with
a newer version available), and after that I can't start seamonkey or
brave-browser. 
Before those updates, both worked fine.

If I try starting seamonkey from Konsole window, it says
Error: no DISPLAY environment variable specified
brave-browser responds with
[52291:52291:0801/012124.252370:ERROR:ui/ozone/platform/x11/ozone_platform_x11.cc:249] Missing X server or $DISPLAY

Using a search engine, I found a hint suggesting to set the DISPLAY
variable with
export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print
$2; exit;}'):0.0
and another one suggesting
export DISPLAY=unix:0.0

Neither of those helped.
With the latter setting, brave-browser gives the same error message as
before, seamonkey says
Error: cannot open display: unix:0.0

The last makes me think there may be a permission problem somewhere, but
I can't guess where it is and what I should do to fix it (except waiting
for the next upgrade packages..)

I run my system on runlevel 3, logging in to a tty console and starting
kde with the command startplasma-wayland

-- 
Jukka Lahtinen

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Thread

Missing X server or $DISPLAY Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2025-08-01 01:36 +0300
  Re: Missing X server or $DISPLAY Lars Poulsen <lars@cleo.beagle-ears.com> - 2025-07-31 23:07 +0000
    Re: Missing X server or $DISPLAY Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2025-08-01 09:50 +0300
      Re: Missing X server or $DISPLAY Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2025-08-01 11:21 +0300

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