Ubuntuaptapt-getaptapt-getLinux .

The apt commands have been introduced to solve this problem. apt consists some of the most widely used features from apt-get, apt-cache and apt-config leaving aside obscure and seldom used features.

sudo gpg -a --export <PUBKEY> | sudo apt-key add - sudo apt-get update Note that when you import a key like this using apt-key you are telling the system that you trust the key you're importing to sign.

Understanding the Context

You need to know why apt-key add is deprecated All of the answers so far work around the symptom ("Don't use apt-key add ") but fail to address the actual problem that led to apt-key add.

In the first place, only apt-get update warns me about Temporary failure resolving 'foo.com', but when I try with nslookup foo.com or ping foo.com, it works fine!

I have successfully installed some packages using the command: sudo apt-get install packagename when I have known in advance that those packages are available. But how can I search for or get a l...

ubuntuapt-get Ubuntu 16.04 apt apt-get apt .

Key Insights

Use this: sudo apt update # Fetches the list of available updates sudo apt upgrade # Installs some updates; does not remove packages sudo apt full-upgrade # Installs updates; may also remove some.

In a nutshell, apt-get update doesn't actually install new versions of software. Instead, it updates the package lists for upgrades for packages that need upgrading, as well as new packages.

I'd like to output a list of all installed packages into a text file so that I can review it and bulk-install on another system. How would I do this?

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