This just happened today and it's still happening.
When I checked and updated the repository using terminal, nothing seemed wrong and weird.
Maybe try
sudo apt --fix-broken install
This is the output:
sudo apt --fix-broken install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
No broken package huh?
Maybe try
sudo apt update && sudo apt full-upgrade
Maybe a repo(sitory) might be causing this.
Do you know why this could happened to me?? Bcs when I listed the packages that need to be updated, there's nothing wrong and strange about it. Anyway, this is the output:
sudo apt update && sudo apt full-upgrade
Hit:1 Index of /ubuntu/ focal InRelease
Hit:2 Index of /ubuntu/ focal-updates InRelease
Hit:3 Index of /ubuntu/ focal-backports InRelease
Hit:4 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 Index of /wine-builds/ubuntu focal InRelease
Hit:6 https://desktop-download.mendeley.com/download/apt stable InRelease
Hit:7 Index of /debian/ stable InRelease
Hit:8 Index of /ubuntu focal-security InRelease
Hit:9 Index of /costales/folder-color/ubuntu focal InRelease
Hit:10 Index of /stable/ focal InRelease
Hit:11 Index of /zorinos/apps/ubuntu focal InRelease
Hit:12 Index of /patches/ focal InRelease
Hit:13 Index of /apps/ focal InRelease
Hit:14 Index of /zorinos/drivers/ubuntu focal InRelease
Hit:15 Index of /drivers/ focal InRelease
Hit:16 Index of /zorinos/patches/ubuntu focal InRelease
Hit:17 Index of /zorinos/stable/ubuntu focal InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
4 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
folder-color-common
The following packages will be upgraded:
firefox firefox-locale-en folder-color folder-color-nemo
4 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
Need to get 63,1 MB of archives.
After this operation, 2.770 kB disk space will be freed.
Do you want to continue? [Y/n]
Get:1 Index of /ubuntu/ focal-updates/main amd64 firefox amd64 113.0+build2-0ubuntu0.20.04.1 [60,5 MB]
Get:2 Index of /costales/folder-color/ubuntu focal/main amd64 folder-color all 0.3.0 [1.789 kB]
Get:3 Index of /costales/folder-color/ubuntu focal/main amd64 folder-color-nemo all 0.3.0 [15,3 kB]
Get:4 Index of /ubuntu/ focal-updates/main amd64 firefox-locale-en amd64 113.0+build2-0ubuntu0.20.04.1 [727 kB]
Fetched 63,1 MB in 2min 48s (376 kB/s)
(Reading database ... 285396 files and directories currently installed.)
Removing folder-color-common (0.0.88+zorin5) ...
(Reading database ... 284847 files and directories currently installed.)
Preparing to unpack .../firefox_113.0+build2-0ubuntu0.20.04.1_amd64.deb ...
Unpacking firefox (113.0+build2-0ubuntu0.20.04.1) over (112.0.2+build1-0ubuntu0.20.04.1) .
..
Preparing to unpack .../firefox-locale-en_113.0+build2-0ubuntu0.20.04.1_amd64.deb ...
Unpacking firefox-locale-en (113.0+build2-0ubuntu0.20.04.1) over (112.0.2+build1-0ubuntu0.
20.04.1) ...
Preparing to unpack .../folder-color_0.3.0_all.deb ...
Unpacking folder-color (0.3.0) over (0.2.0) ...
Preparing to unpack .../folder-color-nemo_0.3.0_all.deb ...
Unpacking folder-color-nemo (0.3.0) over (0.2.0) ...
Setting up firefox (113.0+build2-0ubuntu0.20.04.1) ...
Please restart all running instances of firefox, or you will experience problems.
Setting up folder-color-nemo (0.3.0) ...
Setting up folder-color (0.3.0) ...
gtk-update-icon-cache: Cache file created successfully.
gtk-update-icon-cache: Cache file created successfully.
Setting up firefox-locale-en (113.0+build2-0ubuntu0.20.04.1) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...
And then when I checked the Software Updater, it went back to normal.
I'm still not sure what was causing that problem earlier. Atm, it's back to normal and I'll keep an eye on it in the future.