augusto_sf
August 2nd, 2018, 12:04 PM
I have been trying to upgrade to 18.04 from 17.10, but the system sends me the following error message and then closes the upgrade window (i am working with an ethernet connection so internet is not the problem):
W:http://deb.opera.com/opera/dists/stable/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/jockey-drivers.gpg are ignored as the file is not readable by user '_apt' executing apt-key., W:GPG error: http://deb.opera.com/opera stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D615560BA5C7FF72, E:The repository 'http://deb.opera.com/opera stable InRelease' is not signed., W:Updating from such a repository can't be done securely, and is therefore disabled by default., ETC.
I cannot understand the message since i removed 'Opera' from my system a while ago. Could anyone please suggest a way out of this problem? Thanks a lot.
Augusto
W:http://deb.opera.com/opera/dists/stable/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/jockey-drivers.gpg are ignored as the file is not readable by user '_apt' executing apt-key., W:GPG error: http://deb.opera.com/opera stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D615560BA5C7FF72, E:The repository 'http://deb.opera.com/opera stable InRelease' is not signed., W:Updating from such a repository can't be done securely, and is therefore disabled by default., ETC.
I cannot understand the message since i removed 'Opera' from my system a while ago. Could anyone please suggest a way out of this problem? Thanks a lot.
Augusto