"Sudo apt update" error repository not signed
15413
sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
121470
How to install 'add-apt-repository' using the terminal?
69960
What is sudo apt-get -f install?
96696
timeout errors in apt-get update/install
121946
Problems downloading artifact - error reading signed content
103929
sudo apt upgrade error 18.04 (Broken Packages)
127895
403 Forbidden error in sudo apt-get upgrade ubuntu 17.4
90212
'http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ Release' is not signed
65
What can I do if a repository/PPA does not have a Release file?
82035
Debian: The repository does not have a Release file
155918
What information do I need to solve an APT dependency issue?
38110
Error sudo: add-apt-repository: command not found
60784
relocation error using sudo apt
17596
Invalid signature for Kali Linux repositories : "The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository"
106931
How to undo sudo add-apt-repository?
1520
How to install software or upgrade from an old unsupported release?
116445
"Can't check signature: public key not found" while upgrading, why?