Hi, everyone! Hope you're all having a nice life!

I launched konsole and typed

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upgrade (alias for sudo pkcon refresh && sudo pkcon update)

and this is what I got:

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moltke@neon:~$ upgrade
password for moltke:
Refreshing cache              [=========================]         
Loading cache                 [=========================]         
Refreshing software list      [=========================]         
Downloading packages          [=========================]         
Running                       [=========================]         
Finished                      [=========================]         
Loading cache                 [=========================]         
Refreshing cache              [=========================]         
Waiting in queue              [=========================]         
Loading cache                 [=========================]         
Refreshing software list      [=========================]         
Downloading packages          [=========================]         
Running                       [=========================]         
Finished                      [=========================]         
Loading cache                 [=========================]         
Refreshing cache              [=========================]         
Waiting in queue              [=========================]         
Loading cache                 [=========================]         
Refreshing software list      [=========================]         
Downloading packages          [=========================]         
Running                       [=========================]         
Finished                      [=========================]         
Loading cache                 [=========================]         
Refreshing cache              [=========================]         
Waiting in queue              [=========================]         
Loading cache                 [=========================]         
Refreshing software list      [=========================]         
Downloading packages          [=========================]         
Running                       [=========================]         
Finished                      [=========================]         
Loading cache                 [                         ] (0%) 
Do you want to allow installing of unsigned software? [N/y] N

The unsigned software will not be installed.
                              [=========================]         
Fatal error: user declined interaction
moltke@neon:~$


At first, I typed N and got the Fatal error message, then I tried again by typing y but it got stuck in a refresh/download loop, to then ask again the same thing.
So, I just typed N, copied the whole thing, came here and made this post. I've no idea what this is about.
System:

Operating System: KDE neon Testing Edition
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.3
Kernel Version: 5.13.0-40-generic (64-bit)
Graphics Platform: X11

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Do you want to allow installing of unsigned software? [N/y] N

The unsigned software will not be installed.

Pkcon is bad at showing us full error messages when it runs Apt to install things.

This most likely from a software repo you added, but did not also add the signing key - or it has a missing/broken key.

The easiest way to find out which one, if you are not sure, is to run :

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sudo apt update

This may give you the full error message missing from pkcon. If not, then run:

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sudo apt full-upgrade

And look for the error messages there.

The messaging should give us enough info to fix this.

Thank you! With your help, I managed to fix it.
Thing is, I'd installed sidekick browser just to see what it had to offer, didn't impress me by the way. I use Chrome and Firefox. So, following your suggestion I ran

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sudo apt update

and found out that the file /etc/apt/sources.list.d/sidekick-browser.list was the one causing this issue since it points to deb [arch=amd64] https://dl.google.com/linux/chrome/deb/ stable main and so does the file /etc/apt/sources.list.d/google-chrome-beta.list. I removed sidekick-browser, and commented the repo in that file. Now, everything works as expected.