Update Error - NO_PUBKEY

[????]

What software/application have you tried to add recently ?

Anything between the last successful update and the beginning of the problem.

It's been about half a year since the last update.  I don't think I have added any applications.  If I don't need the repo, I'd like to remove it.

[trinidad]

Open up your package manager. Click Installed. Then click Origin. This will list the Repos. Click the Bullseye repo. That will list the Debian package you installed. Uninstall it from there once you know what it is or correct the Debian URL in your source list if you want to keep it.
It's a newbie here friends so jump the gun advice is not necessarily helpful.
https://www.dbts-analytics.com/htoll.html


TC

[????]

Open up your package manager. Click Installed. Then click Origin. This will list the Repos. Click the Bullseye repo. That will list the Debian package you installed. Uninstall it from there once you know what it is or correct the Debian URL in your source list if you want to keep it.
It's a newbie here friends so jump the gun advice is not necessarily helpful.
https://www.dbts-analytics.com/htoll.html


TC

Now I am able to do update.  Thank you.  Then I try to upgrade qbittorrent, but it says I have the latest version which is not.  The latest version is v4.4.5.  Please help again.

sudo apt upgrade qbittorrent
Reading package lists... Done
Building dependency tree     
Reading state information... Done
qbittorrent is already the newest version (1:4.3.9.99~202110311443-7435-01519b5e7~ubuntu20.04.1).
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

[Şerban S.]

Now I am able to do update.  Thank you.  Then I try to upgrade qbittorrent, but it says I have the latest version which is not.  The latest version is v4.4.5.  Please help again.
[...]
qbittorrent is already the newest version (1:4.3.9.99~202110311443-7435-01519b5e7~ubuntu20.04.1).

Hi!

As I see it, you are mistaking the package version (1:4.3.9.99), for application version.
To check application's version, you need to start the application, then click on the Help menu. You'll find in the pop-up menu the option "About". Click this one and you'll get the running version there.
I use Transmission. From Lite Software, you can install Deluge. They are also bittorrent clients. I use Transmission mainly to download ISO files. Works a little faster than the usual http download. Linux Lite, provides torrent download links, so I tested myself both applications.

All the best!