1icasimpan@example.org:~$ sudo apt list --upgradable 23Listing... Done 4apache2/xenial-updates 2.4.18-2ubuntu3.9 amd64 [upgradable from: 2.4.18-2ubuntu3.8] 5apache2-bin/xenial-updates 2.4.18-2ubuntu3.9 amd64 [upgradable from: 2.4.18-2ubuntu3.8] 6apache2-data/xenial-updates 2.4.18-2ubuntu3.9 all [upgradable from: …

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 …

1sudo add-apt-repository ppa:webupd8team/java 2sudo apt-get update 3sudo apt-get install oracle-java8-installer More details in https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04

1dpkg --get-selections

1apt hold <package> See https://www.tecmint.com/disable-lock-blacklist-package-updates-ubuntu-debian-apt/