1dpkg -s <package> 2apt-cache showpkg <package> See details in https://askubuntu.com/questions/8560/how-do-i-find-out-which-repository-a-package-comes-from

1alaa@aa-lu:~$ apt-cache policy vlc 2vlc: 3Installed: 2.0.8-0ubuntu0.13.04.1 4Candidate: 2.0.8-0ubuntu0.13.04.1 5Version table: 6*** 2.0.8-0ubuntu0.13.04.1 0 7500 http://ae.archive.ubuntu.com/ubuntu/ raring-updates/universe i386 Packages 8500 http://security.ubuntu.com/ubuntu/ raring-security/universe i386 Packages …

1/usr/lib/update-notifier/apt-check -p

1root@jenkins3:~# apt-cache search chromedriver 2chromium-chromedriver - WebDriver driver for the Chromium Browser 3chromium-chromedriver-dbg - chromium-chromedriver debug symbols 4oxideqt-chromedriver - Web browser engine for Qt (transitional package)

1sudo apt-get remove <application_name> some details in https://askubuntu.com/questions/1143/how-can-i-uninstall-software

1/etc/apt/sources.list More info in https://help.ubuntu.com/community/Repositories/CommandLine

1/usr/lib/update-notifier/apt-check --human-readable

1root@jenkins3:~# apt-cache showpkg chromium-chromedriver 2Package: chromium-chromedriver 3Versions: 462.0.3202.62-0ubuntu0.14.04.1204 (/var/lib/apt/lists/mirrors.digitalocean.com_ubuntu_dists_trusty-updates_universe_binary-amd64_Packages) …

Some SSL Certs needs to validate through a text file served in apache. Something like: http://example.org/.well-known/pki-validation/F70E08C160E9B8C7GB488B8AEB246D11B.txt Solution: Add similar configuration in the virtualhost file in apache: 1Alias /.well-known/pki-validation/ …

If you're seeing something like this: 1W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packagecloud.io/github/git-lfs/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is …