Apt-get update encounters errors with bad GPG keys
6105
What is the easiest way to resolve apt-get BADSIG GPG errors?
16578
How to upgrade a single package using apt-get?
152479
Why are apt-get repositories hardcoded to a specific release?
21789
What does 'Ign' , `Get` or 'Hit' mean when running an apt-get update?
69037
How to use https with apt-get?
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
4248
How to fix apt: Signature by key uses weak digest algorithm (SHA1)?
28000
"GPG error:The following signatures were invalid: KEYEXPIRED"
140893
Error when using apt-get update
25001
E: Problem executing scripts APT Update::Post-Invoke-Success error during apt-get update
14028
GPG Error while downloading software: "Clearsigned file isn't valid, got 'NODATA'"
84084
Unable to correctly install pip3 using apt-get
76241
"no public key available" while upgrading using update-manager
73973
After typing "apt-get update" terminal says Could not open lock file
105770
Cannot use apt-get/dpkg -- Input/output error
122742
Why does apt-get install a newer dependency than supported by the specified package
34069
Why am I getting authentication errors for packages from an Ubuntu repository?