query: “no public key available” on apt-get update
positive_passages.docid: 28000
positive_passages.text: "GPG error:The following signatures were invalid: KEYEXPIRED"
negative_passages.docid: 156977
negative_passages.text: Unable to install files with apt-get: "unable to locate package"
negative_passages.docid: 110896
negative_passages.text: Package installation - Outdated repository
negative_passages.docid: 121003
negative_passages.text: GPG error: The following signatures couldn't be verified because the public key is not available
negative_passages.docid: 73973
negative_passages.text: After typing "apt-get update" terminal says Could not open lock file
negative_passages.docid: 21382
negative_passages.text: What does "sudo apt-get update" do?
negative_passages.docid: 64509
negative_passages.text: Can't update from official repositories [Error 409]
negative_passages.docid: 15413
negative_passages.text: sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
negative_passages.docid: 22164
negative_passages.text: Problem with sudo apt get update: The repository cdrom... does not have a Release file
negative_passages.docid: 6105
negative_passages.text: What is the easiest way to resolve apt-get BADSIG GPG errors?
negative_passages.docid: 84988
negative_passages.text: apt-get build-dep is unable to find a source package
negative_passages.docid: 30068
negative_passages.text: Update: Failed to lock /var/cache/apt/archives/lock
negative_passages.docid: 13399
negative_passages.text: Why can I no longer (un)install packages via apt-get after doing a partial dist-upgrade?
negative_passages.docid: 6173
negative_passages.text: "method driver /usr/lib/apt/methods/https could not be found" update error
negative_passages.docid: 28650
negative_passages.text: `apt-get update` cannot find Ubuntu servers
negative_passages.docid: 105451
negative_passages.text: apt update: Could not handshake: An unexpected TLS packet was received
negative_passages.docid: 12368
negative_passages.text: A "failed to fetch" error occurs when apt-get update is run. How do I fix this?