Error when installing pbuilder in Trixie (deckdebuild dependency)

[JedMeister]

Fetched 1633 kB in 1s (2422 kB/s)
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 79, <STDIN> line 9.)
debconf: falling back to frontend: Readline
Preconfiguring packages ...
Configuring pbuilder
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Default mirror not found

Mirror information detection failed and the user provided no mirror information.

Please enter valid mirror information.

Please enter the default mirror you want to be used by pbuilder.

If you leave this field blank, there will be one attempt to autodetect this information. If this attempt fails, you will be prompted again to
insert some valid mirror information.

Here is a valid mirror example: http://deb.debian.org/debian

Default mirror site:

Entering the example deb.debian url works fine when asked by debconf, but we'll need to preseed it, or perhaps work out why it can't figure it out for itself.