Ghost updates

Zorin 18 Pro tells me I have updates available but doesn't list them.
Selecting "Install the Updates" gives the appearance that the update process is beginning; but it stops and returns to the screen stating "Updates are available."
I'm running a dual boot system with Win10 64 bit. Win10 has the latest / last updates.

What is the terminal output of

sudo apt update && sudo apt upgrade

?

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Not certain how I could get the requested info.
I'm also using the Win10 to search for answers to the problem.

Thank you for the lead.

Open a terminal (press Ctrl+Alt+t or search in start menu for terminal) and then enter the command, press enter and type your password when prompted.

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Only to be sure: Do You mean the Software Updater or Gnome Software?

I've been using both Software Updater or Gnome Software, not realizing there is a difference.

The Software Updater brings System Updates and APT-related Updates. Gnome Software brings mostly Flatpak-related Updates.

But the Question is still open where You get the Messages that You have mentioned in Your initial Comment. Also the Output of the Command that @Forpli gave You would be good to have to get further Infos.

I don't understand why there are two different updating programs;
I've been using both to update my system.

"Software Updater" was the one giving the issue.

Here is the requested SUDO information:

Hit:1 Index of /ubuntu noble InRelease
Hit:2 Index of /ubuntu noble-updates InRelease
Hit:3 Index of /ubuntu noble-backports InRelease
Hit:4 Index of /ubuntu noble-security InRelease
Hit:5 Index of /stable/ noble InRelease
Hit:6 Index of /patches/ noble InRelease
Hit:7 Index of /apps/ noble InRelease
Hit:8 https://packages.mozilla.org/apt mozilla InRelease
Hit:9 Index of /drivers/ noble InRelease
Hit:10 Index of /zorinos/apps/ubuntu noble InRelease
Hit:11 Zorin OS Pro - Zorin OS noble InRelease
Hit:12 Index of /zorinos/drivers/ubuntu noble InRelease
Hit:13 Index of /zorinos/patches/ubuntu noble InRelease
Hit:14 Index of /zorinos/stable/ubuntu noble InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
3 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
folder-color libappstream-glib8 libwoff1
Use 'sudo apt autoremove' to remove them.
The following packages will be upgraded:
libfreerdp-server3-3 libfreerdp3-3 libwinpr3-3
The following packages will be DOWNGRADED:
firefox
3 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
Need to get 88.4 MB of archives.
After this operation, 321 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 Index of /ubuntu noble-updates/main amd64 libfreerdp-server3-3 amd64 3.5.1+dfsg1-0ubuntu1.6 [143 kB]
Get:2 Index of /ubuntu noble-updates/main amd64 libfreerdp3-3 amd64 3.5.1+dfsg1-0ubuntu1.6 [820 kB]
Get:3 Index of /ubuntu noble-updates/main amd64 libwinpr3-3 amd64 3.5.1+dfsg1-0ubuntu1.6 [387 kB]
Get:4 https://packages.mozilla.org/apt mozilla/main amd64 firefox amd64 152.0~build1 [87.1 MB]
Fetched 88.4 MB in 9s (10.4 MB/s)
dpkg: warning: downgrading firefox from 1:1snap1-0ubuntu5 to 152.0~build1
(Reading database ... 398161 files and directories currently installed.)
Preparing to unpack .../firefox_152.0~build1_amd64.deb ...
Unpacking firefox (152.0~build1) over (1:1snap1-0ubuntu5) ...
Preparing to unpack .../libfreerdp-server3-3_3.5.1+dfsg1-0ubuntu1.6_amd64.deb ...
Unpacking libfreerdp-server3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) over (3.5.1+dfsg1-
0ubuntu1.5) ...
Preparing to unpack .../libfreerdp3-3_3.5.1+dfsg1-0ubuntu1.6_amd64.deb ...
Unpacking libfreerdp3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) over (3.5.1+dfsg1-0ubuntu
1.5) ...
Preparing to unpack .../libwinpr3-3_3.5.1+dfsg1-0ubuntu1.6_amd64.deb ...
Unpacking libwinpr3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) over (3.5.1+dfsg1-0ubuntu1.
5) ...
Setting up libwinpr3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) ...
Setting up firefox (152.0~build1) ...
update-alternatives: updating alternative /usr/bin/firefox because link group gn
ome-www-browser has changed slave links
update-alternatives: updating alternative /usr/bin/firefox because link group x-
www-browser has changed slave links
Setting up libfreerdp3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) ...
Setting up libfreerdp-server3-3:amd64 (3.5.1+dfsg1-0ubuntu1.6) ...
Processing triggers for desktop-file-utils (0.27-2build1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.36.0-1.1ubuntu3) ...
Processing triggers for libc-bin (2.39-0ubuntu8.7) ...
Processing triggers for man-db (2.12.0-4build2) ...
Processing triggers for mailcap (3.70+nmu1ubuntu1) ...

Each do different Things. Let it us stay there for now.

The Update Process looks good for me so far. There was something with Firefox but that is not important now. When You now have done this, does the Software Updater behave now normal again?

Yes. Thank you for your support.