These are the results when the server is not broken (before trying to update via the web interface):
$ sudo dpkg -l | egrep "zen(tyal|buntu)-"
ii zenbuntu-core 8.0.0ubuntu1 all Zentyal Environment for Ubuntu Server
ii zenbuntu-desktop 8.0.0ubuntu1 all Zentyal Desktop Environment for Ubuntu Server
iF zentyal-core 8.0.0 all Zentyal - Core
iU zentyal-dns 8.0.0 all Zentyal - DNS Server
iU zentyal-firewall 8.0.0 all Zentyal - Firewall
iU zentyal-network 8.0.2 all Zentyal - Network Configuration
iU zentyal-ntp 8.0.0 all Zentyal - NTP Service
iU zentyal-radius 8.0.0 all Zentyal - RADIUS
iU zentyal-samba 8.0.0 all Zentyal - Domain Controller and File Sharing
iU zentyal-software 8.0.0 all Zentyal - Software Management
$ sudo apt update
Hit:1
https://download.docker.com/linux/ubuntu jammy InRelease
Get:2
http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Hit:3
https://packages.mozilla.org/apt mozilla InRelease
Hit:4
https://packages.zentyal.org/zentyal 8.0 InRelease
Get:5
http://security.ubuntu.com/ubuntu jammy-security/main i386 Packages [444 kB]
Get:6
http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages [1,343 kB]
Hit:7
http://us.archive.ubuntu.com/ubuntu jammy InRelease
Get:8
http://us.archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB]
Hit:9
http://us.archive.ubuntu.com/ubuntu jammy-backports InRelease
Get:10
http://security.ubuntu.com/ubuntu jammy-security/main Translation-en [237 kB]
Get:11
http://security.ubuntu.com/ubuntu jammy-security/universe i386 Packages [599 kB]
Get:12
http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages [852 kB]
Fetched 3,703 kB in 10s (367 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
22 packages can be upgraded. Run 'apt list --upgradable' to see them.
$ sudo apt list --upgradable
Listing... Done
bsdextrautils/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
bsdutils/jammy-updates,jammy-security 1:2.37.2-4ubuntu3.4 amd64 [upgradable from: 1:2.37.2-4ubuntu3.3]
eject/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
ethtool/jammy-updates 1:5.16-1ubuntu0.1 amd64 [upgradable from: 1:5.16-1]
fdisk/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
firefox/mozilla 124.0.2~build1 amd64 [upgradable from: 124.0.1~build1]
libblkid1/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
libfdisk1/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
libmount1/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
libnspr4/jammy-security 2:4.35-0ubuntu0.22.04.1 amd64 [upgradable from: 2:4.32-3build1]
libnss3-tools/jammy-security 2:3.98-0ubuntu0.22.04.1 amd64 [upgradable from: 2:3.68.2-0ubuntu1.2]
libnss3/jammy-security 2:3.98-0ubuntu0.22.04.1 amd64 [upgradable from: 2:3.68.2-0ubuntu1.2]
libsmartcols1/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
libuuid1/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
linux-generic/jammy-updates,jammy-security 5.15.0.102.99 amd64 [upgradable from: 5.15.0.101.98]
linux-headers-generic/jammy-updates,jammy-security 5.15.0.102.99 amd64 [upgradable from: 5.15.0.101.98]
linux-image-generic/jammy-updates,jammy-security 5.15.0.102.99 amd64 [upgradable from: 5.15.0.101.98]
mount/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
qemu-guest-agent/jammy-updates 1:6.2+dfsg-2ubuntu6.18 amd64 [upgradable from: 1:6.2+dfsg-2ubuntu6.17]
util-linux/jammy-updates,jammy-security 2.37.2-4ubuntu3.4 amd64 [upgradable from: 2.37.2-4ubuntu3.3]
xserver-common/jammy-updates,jammy-updates,jammy-security,jammy-security 2:21.1.4-2ubuntu1.7~22.04.10 all [upgradable from: 2:21.1.4-2ubuntu1.7~22.04.8]
xserver-xorg-core/jammy-updates,jammy-security 2:21.1.4-2ubuntu1.7~22.04.10 amd64 [upgradable from: 2:21.1.4-2ubuntu1.7~22.04.8]