This error shows up on Ubuntu 25.10 (fresh install) You're running in a GNOME environment but the OS keyring is not available for encryption. Ensure you have gnome ...
Because /etc/apt/trusted.gpg.d is a way to add keys to the keyring (/etc/apt/trusted.gpg) w/o apt-key add, by copying files. Also note that: The recommended locations for keyrings are /usr/share/keyrings for keyrings managed by packages, and /etc/apt/keyrings for keyrings managed by the system operator.
The Gnome Keyring is used by Gnome-ish apps to store secrets on your behalf. The secrets are stuff like SSH keys, keys to wifi networks, et cetera. If you want to poke at your keyring, go to the Accessories menu and run the app called "Passwords and Encryption Keys." It will show your a number of folders on the Password tab - each one of those is called a keyring. Each entry under a folder is ...
The leather used was a much darker shade than other Jacka Indy 4's that I've owned (as Terry notes that he can make no guarantees on the color because he doesn't tan the hides himself.) It's more of a whiskey, or reddish brown color with the standard saddle tan knots.
The color of Todd's boots is pretty similar to the 405's.The lining on the inside is leather. Before, the 405's used to have cotton lining, but now the standard lining for them is leather.
A keyring is a "stored database" -- I'm using this term lightly -- of your login information stored on your local PC. It's wrapped by some magic voodoo encryption schema (PKCS#11 - this is used for secure storage on removable media) so it's going to be relatively secure from prying eyes.