Ubuntu
update-manager package

  1. Bug #213890
  2. Comment #5

Comment 5 for bug 213890

Revision history for this message
Chris Coulson (chrisccoulson) wrote :

That's because you haven't added the GPG key for Medibuntu. Please do:

sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

Please refer to https://help.ubuntu.com/community/Medibuntu#Adding%20the%20Repositories