Getting GPG error while running "sudo apt-get update" command
6105
What is the easiest way to resolve apt-get BADSIG GPG errors?
152823
PPAs will not install "sudo: add-apt-repository: command not found"
49149
How do I solve "Unable to fetch some archives, maybe run apt-get update or try with --fix-missing" error?
97588
sudo apt-get 'NOSPLIT Error'
14028
GPG Error while downloading software: "Clearsigned file isn't valid, got 'NODATA'"
150033
E: Sub-process /usr/bin/dpkg returned an error code (1) for almost all updates
21795
Apt-get update with an @ in password error
121470
How to install 'add-apt-repository' using the terminal?
13744
sudo apt-get update failing - "could not open" list file due to "permission denied"
127895
403 Forbidden error in sudo apt-get upgrade ubuntu 17.4
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
16753
Why should I regularly run 'apt-get update' and similar commands?
69960
What is sudo apt-get -f install?
28000
"GPG error:The following signatures were invalid: KEYEXPIRED"
122588
Can't connect to ubuntu archive when using apt-get update
11909
404 error with apt-get update, Don't have any PPA's
154648
Getting error from apt-get when trying to install php5 package