error while trying to sudo apt-get update GPG, no sign repository
6809
How do I fix the GPG error "NO_PUBKEY"?
121470
How to install 'add-apt-repository' using the terminal?
4248
How to fix apt: Signature by key uses weak digest algorithm (SHA1)?
105770
Cannot use apt-get/dpkg -- Input/output error
105451
apt update: Could not handshake: An unexpected TLS packet was received
28383
Failed to search for file: Failed to download gpg key for repo 'mariadb-main': Curl error (37)
103929
sudo apt upgrade error 18.04 (Broken Packages)
35152
Dependency errors for python3 and many others when I run sudo apt-get upgrade
46720
sudo apt update error: "Release file is not yet valid"
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed
115648
dpkg exit with error "cannot scan updates directory `/var/lib/dpkg/updates/': No such file or directory", how to fix it?
15413
sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
339
How to resolve "Failed to download repository information"?
14028
GPG Error while downloading software: "Clearsigned file isn't valid, got 'NODATA'"
21184
Running "sudo apt-get update" returns connection errors
130650
E: The repository 'http//archive.canonical.com precise Release' is not signed
28000
"GPG error:The following signatures were invalid: KEYEXPIRED"