Got a bit further with this.

"update-alternatives --get-selections | grep terminal"

- shows that the default setting for x-terminal-emulator is
/usr/bin/zutty - and apparently that's what's throwing the weird GLSL
error.

Only found one relevant post so far:

https://wiki.webevaluation.nl/xfce-terminal

(In the version of daedalus running in the virtualbox VM, installed
about 2 months ago, the alternative setting for x-terminal emulator is
/usr/bin/xfce4-terminal.wrapper. And - /usr/bin/zutty doesn't exist.)

I've never heard of zutty before. Apparently it's quite new. I'll try
to find out why the version on daedalus is throwing that error.

https://www.linuxlinks.com/zutty-high-end-terminal-emulator-low-end-systems/

On Fri, 2025-04-18 at 15:59 +0100, Peter Duffy wrote:
> I've just been installing daedalus on an old Dell notebook, and hit a
> strange problem. (Don't think the hardware is relevant, but I could
> be
> wrong.)
>
> I left the desktop to default to xfce4 (I always use that anyway).
> Install completed successfully. However, when I tried to open a
> terminal via the icon on the launchpad, I got:
>
> "Failed to execute default terminal emulator: input/output error"
>
> The command executed was "exo-open --launch TerminalEmulator" (which
> I
> think is standard for this in xfce4)
>
> I checked applications -> settings -> default applications ->
> utilities
> -> terminal emulator: set to "Debian X Terminal Emulator".
>
> In /usr/share/xfce4/helpers/debian-x-terminal-emulator, X-XFCE-
> Binaries
> is set to "x-terminal-emulator"
>
> If I run /usr/bin/x-terminal-emulator, it bombs with the following:
>
>
>
> Error: Compiling fragment shader:
>
> 0:1(10): error: GLSL ES 3.10 is not supported. Supported versions
> are:
> 1.00 ES, and 3.00 ES
>
> terminate called after throwing an instance of 'std::system_error'
>   what():  Resource deadlock avoided
>
>
>
> At the moment, that's as far as I've got with
> investigation/diagnosis.
>
> Workaround was straightforward: just set the xfce4 terminal emulator
> to
> "xfce4-terminal".
>
> Weird thing is that I installed daedalus into a virtualbox VM about 2
> months ago: the terminal icon pointed to x-terminal-emulator,  and x-
> terminal-emulator worked fine. I've just done an update/upgrade on
> it,
> and it still works.
>
> Sorry if this is a well-known problem.  If not, I'm happy to raise it
> as a bug if required.
>
>
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