I cant upgrade from 22.04 to 24.04 i get this error message.
W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., W:GPG error: http://mx.archive.ubuntu.com/ubuntu bionic-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32, E:The repository 'http://mx.archive.ubuntu.com/ubuntu bionic-updates InRelease' is not signed., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., W:GPG error: http://security.ubuntu.com/ubuntu bionic-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32, E:The repository 'http://security.ubuntu.com/ubuntu bionic-security InRelease' is not signed.
Please help. i am a complete newbe with linux
