I am running 21.04 When I run update it shows several errors. How do I correct them? or should they be ignored? Thanks Cliff
results of apt update
Ign:9 http://linux.dropbox.com/ubuntu eoan InRelease
Err:10 http://linux.dropbox.com/ubuntu eoan Release
404 Not Found [IP: 13.227.39.129 80]
Err:8 http://archive.canonical.com/ubuntu bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Reading package lists... Done
E: The repository 'http://linux.dropbox.com/ubuntu eoan Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://archive.canonical.com/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://archive.canonical.com/ubuntu bionic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
eoan
is Ubuntu 19.04, which is not anymore supported. The output also shows bionic (18.04), whereas you said it is 21.04. Please clarify your release. Don't mix repositories between different versions of Ubuntu. Don't make a FrankenSystem