During the minimal upgrade from Bookworm to Trixie my terminal disappeared and
I couldn't start another no more. I couldn't even switch to any VT.
I recovered the upgrade from an SSH terminal, from another device. After a
"dpkg --configure -a" and another "apt upgrade --without-new-pkgs" execution,
desktop terminals were avalaible again.

My previous release is: bookworm
I am upgrading to: trixie
Archive date: <Timestamp, available as project/trace/ftp-master.debian.org
     on your mirror or .disk/info on your CD/DVD set>
Upgrade date: 2025-08-11  20:33:39
uname -a after upgrade: Linux Casa 6.12.41+deb13-amd64 #1 SMP PREEMPT_DYNAMIC
Debian 6.12.41-1 (2025-08-12) x86_64 GNU/Linux
Method: I strictly followed upgrading instructions from Trixie release notes.
Issue occurred upgrading in a Gnome terminal under Xorg, during "apt upgrade
--without-new-pkgs" execution.

Contents of /etc/apt/sources.list:
--
Types: deb deb-src
URIs: https://deb.debian.org/debian
Suites: trixie trixie-updates
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg

Types: deb deb-src
URIs: https://security.debian.org/debian-security
Suites: trixie-security
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
--

Further Comments/Problems:

Dpkg and apt status and logs attached.

package: fonts-cantarell

changelog for v 0.303.1-3:
- Explicitly build and install only the variable font
- switch to variable font

changelog for v 0.303.1-4:
- Create a debian/NEWS file to inform users about the requirement to restart the desktop session immediately after the font upgrade

During the minimal upgrade from Bookworm to Trixie, first all characters in the texts in
window decorations, menus &c. (which use Cantarell) disappeared and were replaced by
boxes, then the Gonme terminal crashed (disappeared) when I tried to open a new tab and
could not be restarted. The Gnome session became unusable (white error screen).

On a console terminal not used by Gnome I could see (ps -AHf) that Apt was still working
using /dev/pts/1. When it had stopped working I could continue the upgrade process on the
console.

GDM and Gnome only became usable again after ‘apt full-upgrade.’