Zorin OS 18.1 Pro
The updater presents what appears to be an empty update every day. It is 87.4 MB and the list of updates is empty. If I click install, the progress bar quickly fills and the dialog closes. A bit later, the same dialog re-appears. This will repeat until my keyboard is worn out. I now routinely click remind me later. I can find no reference to this in the forum. BTW other updates are installing without problems.
Can you please run in terminal
sudo apt update && sudo apt upgrade
and post the output here?
jim@Jims-Ryzen-Desktop:~$ sudo apt update && sudo apt upgrade
[sudo] password for jim:
Get:1 Index of /ubuntu noble-updates InRelease [126 kB]
Get:2 Index of /repos/code/ stable InRelease [3,590 B]
Get:3 https://dl.google.com/linux/chrome-stable/deb stable InRelease [1,825 B]
Hit:4 Index of /zorinos/apps/ubuntu noble InRelease
Get:5 Index of /ubuntu noble-security InRelease [126 kB]
Get:6 Index of /repos/code/ stable/main amd64 Packages [26.3 kB]
Hit:7 Index of /zorinos/drivers/ubuntu noble InRelease
Get:8 Index of /ubuntu noble-backports InRelease [126 kB]
Get:9 https://dl.google.com/linux/chrome-stable/deb stable/main amd64 Packages [1,218 B]
Hit:10 Index of /zorinos/patches/ubuntu noble InRelease
Hit:11 https://packages.mozilla.org/apt mozilla InRelease
Hit:12 Index of /zorinos/stable/ubuntu noble InRelease
Get:13 Index of /ubuntu noble-updates/main amd64 Components [181 kB]
Get:14 Index of /ubuntu noble-updates/universe amd64 Components [388 kB]
Get:15 Index of /ubuntu noble-updates/multiverse amd64 Components [940 B]
Get:16 Index of /ubuntu noble-backports/main amd64 Components [5,760 B]
Get:17 Index of /ubuntu noble-backports/universe amd64 Components [10.5 kB]
Get:18 Index of /ubuntu noble-security/main amd64 Components [44.9 kB]
Get:19 Index of /ubuntu noble-security/universe amd64 Components [76.3 kB]
Hit:20 Index of /ubuntu noble InRelease
Hit:21 https://updates.signal.org/desktop/apt xenial InRelease
Hit:22 Index of /stable/ noble InRelease
Hit:23 Index of /patches/ noble InRelease
Hit:24 Index of /apps/ noble InRelease
Hit:25 Index of /drivers/ noble InRelease
Hit:26 Zorin OS Pro - Zorin OS noble InRelease
Fetched 1,119 kB in 17s (65.9 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
libfwupd2
Use 'sudo apt autoremove' to remove it.
The following packages will be DOWNGRADED:
firefox
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
Need to get 87.4 MB of archives.
After this operation, 322 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 https://packages.mozilla.org/apt mozilla/main amd64 firefox amd64 152.0.5~build1 [87.4 MB]
Fetched 87.4 MB in 23s (3,731 kB/s)
dpkg: warning: downgrading firefox from 1:1snap1-0ubuntu5 to 152.0.5~build1
(Reading database ... 633784 files and directories currently installed.)
Preparing to unpack .../firefox_152.0.5~build1_amd64.deb ...
Unpacking firefox (152.0.5~build1) over (1:1snap1-0ubuntu5) ...
Setting up firefox (152.0.5~build1) ...
Processing triggers for man-db (2.12.0-4build2) ...
Processing triggers for mailcap (3.70+nmu1ubuntu1) ...
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) ...
jim@Jims-Ryzen-Desktop:~$
After running your command line, I saw the firefox download msg. The prompt for the 87.4MB update appeared again and I said yes. I then rebooted and ran you command again. This time the firefox msg was missing. I imagine the issue is resolved. I'll post again if the 87.4 reappears. Thanks for your support. I appreciate it. Just to be complete, I will post the output when I ran your line again.
jim@Jims-Ryzen-Desktop:~$ sudo apt update && sudo apt upgrade
[sudo] password for jim:
Hit:1 Index of /ubuntu noble-updates InRelease
Hit:2 Index of /ubuntu noble-backports InRelease
Hit:3 https://dl.google.com/linux/chrome-stable/deb stable InRelease
Hit:4 Index of /repos/code/ stable InRelease
Hit:5 Index of /zorinos/apps/ubuntu noble InRelease
Hit:6 Index of /ubuntu noble-security InRelease
Hit:7 Index of /zorinos/drivers/ubuntu noble InRelease
Hit:8 Index of /zorinos/patches/ubuntu noble InRelease
Hit:9 Index of /zorinos/stable/ubuntu noble InRelease
Hit:10 https://updates.signal.org/desktop/apt xenial InRelease
Hit:11 Index of /ubuntu noble InRelease
Hit:12 https://packages.mozilla.org/apt mozilla InRelease
Hit:13 Index of /stable/ noble InRelease
Hit:14 Index of /patches/ noble InRelease
Hit:15 Index of /apps/ noble InRelease
Hit:16 Index of /drivers/ noble InRelease
Hit:17 Zorin OS Pro - Zorin OS noble InRelease
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
libfwupd2
Use 'sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
jim@Jims-Ryzen-Desktop:~$ sudo apt autoremove
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
libfwupd2
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 507 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 633843 files and directories currently installed.)
Removing libfwupd2:amd64 (1.9.34-0ubuntu1~24.04.1) ...
Processing triggers for libc-bin (2.39-0ubuntu8.7) ...
jim@Jims-Ryzen-Desktop:~$
Unfortunately, it sounds like Firefox has been replaced by the Snap version on your system (this sometimes happens unintentionally because Ubuntu pushes its Snap packages).
If you're not happy with this, or if Firefox no longer works the way it used to, you can check whether Firefox is installed as a Snap using
snap list
You get a list with all snap packages.
These threads may help you:
Thanx for this explanation re firefox. I have used Firefox since before fire was discovered, but lately I have been having various problems including scrambled bookmarks. I don't want to use Chrome, but I guess I will. I have to use it anyway when I connect to my bank which only supports Chrome and Edge. Anyway, I haven't been prompted for the 48.7 MB update today.
I am uncertain of the best way to proceed here. I closed the original as solved about 13 days ago. I have not had a recurrence since then. But today, I have a new, very similar event happening. Everything looks the same except the size is slightly different.
Can you please run
sudo apt update && sudo apt upgrade
again and post the terminal output here?

