Error updating: Temporary failure resolving 'deb.debian.org'

What type of hardware are you using: Old laptop or computer
What YunoHost version are you running: 12.0.16
How are you able to access your server: The webadmin
SSH
Direct access via physical keyboard/screen
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: no

Describe your issue

Error updating system:

Share relevant logs or error messages

W: Failed to fetch http://deb.debian.org/debian/dists/bookworm/InRelease Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://security.debian.org/debian-security/dists/bookworm-security/InRelease Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/bookworm-updates/InRelease Temporary failure resolving 'deb.debian.org'
W: Failed to fetch https://packages.sury.org/php/dists/bookworm/InRelease Temporary failure resolving 'packages.sury.org'
W: Failed to fetch http://forge.yunohost.org/debian/dists/bookworm/InRelease Temporary failure resolving 'forge.yunohost.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
Something went wrong while updating the cache of APT (Debian's package manager). Here is a dump of the sources.list lines, which might help identify problematic lines:
sources.list:deb http://deb.debian.org/debian/ bookworm main
sources.list:deb-src http://deb.debian.org/debian/ bookworm main
sources.list:deb http://security.debian.org/debian-security bookworm-security main
sources.list:deb-src http://security.debian.org/debian-security bookworm-security main
sources.list:deb http://deb.debian.org/debian/ bookworm-updates main
sources.list:deb-src http://deb.debian.org/debian/ bookworm-updates main
sources.list.d/yunohost.list:deb [signed-by=/usr/share/keyrings/yunohost-bookworm.gpg] http://forge.yunohost.org/debian/ bookworm stable
sources.list.d/extra_php_version.list:deb https://packages.sury.org/php/ bookworm main
Updating application catalog…
Unable to download the default app catalog: Failed to connect to https://app.yunohost.org/default/v3/apps.json... maybe the service is down, or you are not properly connected to the Internet in IPv4/IPv6.
Nothing to do. Everything is already up-to-date.

Temporary failure resolving 'deb.debian.org'

Sounds like DNS resolution is broken for some reason … Can you double-check that dnsmasq is running in Tools > Services

and that sudo cat /etc/resolv.conf shows nameservr 127.0.0.1 ?

Alternatively the diagnosis is probably complaining about something

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