How do I resolve apt GPG error NO_PUBKEY?
6809
How do I fix the GPG error "NO_PUBKEY"?
11671
"Unable to locate package" while trying to install packages with APT
34069
Why am I getting authentication errors for packages from an Ubuntu repository?
74227
dpkg error when using apt-get install
121470
How to install 'add-apt-repository' using the terminal?
147336
How to fix dpkg error [2]?
120521
Installing .pkg with terminal ?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
81853
W:Skipping acquire of configured file 'main/binary-1386/Packages' as repository... doesn't support architecture '1386'
76241
"no public key available" while upgrading using update-manager
58759
How to fix missing GPG keys?
10381
ModuleNotFoundError: No module named 'apt_pkg' error
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
78011
Unable to install package post adding ppa
154622
How do I resolve this installation error?
132495
14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing
17208
What does this apt error message ("Download is performed unsandboxed as root...") mean?