Ubuntu 23.04 Key is stored in Legacy Trusted.gpg Keyring

Solving Key is stored in Legacy Trusted.gpg Keyring in Ubuntu 23.04

Hi! This Guide is Solving the “Key is stored in Legacy Trusted.gpg Keyring” Issue in Ubuntu Lunar 23.04 GNU/Linux.

The former apt-key is deprecated, except for the use of apt-key del in maintainer scripts to remove existing keys from the main keyring.

Finally, this Setup is valid for all the Ubuntu-based Distros like:

• Linux Mint
• Zorin OS
• Lubuntu
• Elementary OS
• Kde Neon
• Pop_OS!
• Xubuntu
• Linux Lite
• Bodhi
• Puppy
• Kubuntu
• LXLE
• Trisquel
• Voyager Ubuntu
• feren OS
• Peppermint
• Linux Ultimate Edition
(You may just need to Discover what’s the Parent Release)

1. 1. Setting up Key

   Now to Set up GPG Key in Ubuntu
   First, set the Target Directory with:

   sudo install -m 0755 -d /etc/apt/keyrings

   The General Command is:

   curl -fsSL [MYKEYURL].[GPG/ASC] | sudo gpg --dearmor -o /etc/apt/keyrings/[MYKEYNAME].gpg

   Amend conformly the [MY…] in the above Command.
   The “dearmor” Flag provide to the possible Decryption.
   So for example:

   curl -fsSL http://download.virtualbox.org/virtualbox/debian/oracle_vbox_2016.asc | sudo gpg --dearmor -o /etc/apt/keyrings/virtualbox.gpg

2. 2. Fixing Repo

   Next, provide to Sign Apt Repository properly
   So Edit the Configuration File:
   (Here for simplicity with the nano Editor, but you can just use Anyone.)

   sudo nano /etc/apt/sources.list.d/[MYREPO].list

   And modify the Line inserting:

   [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/[MYKEY].gpg]

   So in case to follow the former Example like:

   [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/virtualbox.gpg]

   Ctrl+w to Search.
   Finally, Ctrl+x to Save & Exit from nano Editor.
   Last, Refresh the Apt Sources:

   sudo apt update

   And Happy Apt Software! ;)