apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8))
94228
What commands (exactly) should replace the deprecated apt-key?
36886
How to install a deb file, by dpkg -i or by apt?
124704
Distinction between apt-cache and dpkg -l
120872
What is apt-cache used for?
54710
How can I re install the APT Tool?
83924
error while trying to sudo apt-get update GPG, no sign repository
154520
How to reinstall apt on Debian?
92858
"Wrong version of key store" error. How can I create a version=1 keystore certificate?
69037
How to use https with apt-get?
728
Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?
30068
Update: Failed to lock /var/cache/apt/archives/lock
125721
How to disable GNOME keyring?
123300
Invalid keystore format
126538
Ubuntu 12.04 GPG error: http://archive.ubuntu.com precise Release: The following signatures were invalid: NODATA 1 NODATA 2
85711
verifiying ubuntu iso with repository gpg-keys
38476
How do you open Apt links in Ubuntu?
124649
E: Repository 'http://security.ubuntu.com/ubuntu bionic-security InRelease' changed its 'Suite' value from 'bionic-updates' to 'bionic-security'